21031290

素因数分解:

$2^1\times 3^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{251}}^1$

素因数の和:297

約数の個数: 144

約数和(自身を含む): 67223520

約数和(自身を除く): 46192230

約数列:

[1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 19, 21, 30, 35, 38, 42, 45, 49, 57, 63, 70, 90, 95, 98, 105, 114, 126, 133, 147, 171, 190, 210, 245, 251, 266, 285, 294, 315, 342, 399, 441, 490, 502, 570, 630, 665, 735, 753, 798, 855, 882, 931, 1197, 1255, 1330, 1470, 1506, 1710, 1757, 1862, 1995, 2205, 2259, 2394, 2510, 2793, 3514, 3765, 3990, 4410, 4518, 4655, 4769, 5271, 5586, 5985, 7530, 8379, 8785, 9310, 9538, 10542, 11295, 11970, 12299, 13965, 14307, 15813, 16758, 17570, 22590, 23845, 24598, 26355, 27930, 28614, 31626, 33383, 36897, 41895, 42921, 47690, 52710, 61495, 66766, 71535, 73794, 79065, 83790, 85842, 100149, 110691, 122990, 143070, 158130, 166915, 184485, 200298, 214605, 221382, 233681, 300447, 333830, 368970, 429210, 467362, 500745, 553455, 600894, 701043, 1001490, 1106910, 1168405, 1402086, 1502235, 2103129, 2336810, 3004470, 3505215, 4206258, 7010430, 10515645, 21031290]

約数ペア:

[(1, 21031290), (2, 10515645), (3, 7010430), (5, 4206258), (6, 3505215), (7, 3004470), (9, 2336810), (10, 2103129), (14, 1502235), (15, 1402086), (18, 1168405), (19, 1106910), (21, 1001490), (30, 701043), (35, 600894), (38, 553455), (42, 500745), (45, 467362), (49, 429210), (57, 368970), (63, 333830), (70, 300447), (90, 233681), (95, 221382), (98, 214605), (105, 200298), (114, 184485), (126, 166915), (133, 158130), (147, 143070), (171, 122990), (190, 110691), (210, 100149), (245, 85842), (251, 83790), (266, 79065), (285, 73794), (294, 71535), (315, 66766), (342, 61495), (399, 52710), (441, 47690), (490, 42921), (502, 41895), (570, 36897), (630, 33383), (665, 31626), (735, 28614), (753, 27930), (798, 26355), (855, 24598), (882, 23845), (931, 22590), (1197, 17570), (1255, 16758), (1330, 15813), (1470, 14307), (1506, 13965), (1710, 12299), (1757, 11970), (1862, 11295), (1995, 10542), (2205, 9538), (2259, 9310), (2394, 8785), (2510, 8379), (2793, 7530), (3514, 5985), (3765, 5586), (3990, 5271), (4410, 4769), (4518, 4655)]