19666400

素因数分解:

$2^5\times 5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:125

約数の個数: 144

約数和(自身を含む): 54246528

約数和(自身を除く): 34580128

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 31, 32, 40, 50, 52, 61, 62, 65, 80, 100, 104, 122, 124, 130, 155, 160, 200, 208, 244, 248, 260, 305, 310, 325, 400, 403, 416, 488, 496, 520, 610, 620, 650, 775, 793, 800, 806, 976, 992, 1040, 1220, 1240, 1300, 1525, 1550, 1586, 1612, 1891, 1952, 2015, 2080, 2440, 2480, 2600, 3050, 3100, 3172, 3224, 3782, 3965, 4030, 4880, 4960, 5200, 6100, 6200, 6344, 6448, 7564, 7930, 8060, 9455, 9760, 10075, 10400, 12200, 12400, 12688, 12896, 15128, 15860, 16120, 18910, 19825, 20150, 24400, 24583, 24800, 25376, 30256, 31720, 32240, 37820, 39650, 40300, 47275, 48800, 49166, 60512, 63440, 64480, 75640, 79300, 80600, 94550, 98332, 122915, 126880, 151280, 158600, 161200, 189100, 196664, 245830, 302560, 317200, 322400, 378200, 393328, 491660, 614575, 634400, 756400, 786656, 983320, 1229150, 1512800, 1966640, 2458300, 3933280, 4916600, 9833200, 19666400]

約数ペア:

[(1, 19666400), (2, 9833200), (4, 4916600), (5, 3933280), (8, 2458300), (10, 1966640), (13, 1512800), (16, 1229150), (20, 983320), (25, 786656), (26, 756400), (31, 634400), (32, 614575), (40, 491660), (50, 393328), (52, 378200), (61, 322400), (62, 317200), (65, 302560), (80, 245830), (100, 196664), (104, 189100), (122, 161200), (124, 158600), (130, 151280), (155, 126880), (160, 122915), (200, 98332), (208, 94550), (244, 80600), (248, 79300), (260, 75640), (305, 64480), (310, 63440), (325, 60512), (400, 49166), (403, 48800), (416, 47275), (488, 40300), (496, 39650), (520, 37820), (610, 32240), (620, 31720), (650, 30256), (775, 25376), (793, 24800), (800, 24583), (806, 24400), (976, 20150), (992, 19825), (1040, 18910), (1220, 16120), (1240, 15860), (1300, 15128), (1525, 12896), (1550, 12688), (1586, 12400), (1612, 12200), (1891, 10400), (1952, 10075), (2015, 9760), (2080, 9455), (2440, 8060), (2480, 7930), (2600, 7564), (3050, 6448), (3100, 6344), (3172, 6200), (3224, 6100), (3782, 5200), (3965, 4960), (4030, 4880)]