21113015

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:144

約数の個数: 64

約数和(自身を含む): 34283520

約数和(自身を除く): 13170505

約数列:

[1, 5, 7, 11, 29, 31, 35, 55, 61, 77, 145, 155, 203, 217, 305, 319, 341, 385, 427, 671, 899, 1015, 1085, 1595, 1705, 1769, 1891, 2135, 2233, 2387, 3355, 4495, 4697, 6293, 8845, 9455, 9889, 11165, 11935, 12383, 13237, 19459, 20801, 23485, 31465, 49445, 54839, 61915, 66185, 69223, 97295, 104005, 136213, 145607, 274195, 346115, 383873, 603229, 681065, 728035, 1919365, 3016145, 4222603, 21113015]

約数ペア:

[(1, 21113015), (5, 4222603), (7, 3016145), (11, 1919365), (29, 728035), (31, 681065), (35, 603229), (55, 383873), (61, 346115), (77, 274195), (145, 145607), (155, 136213), (203, 104005), (217, 97295), (305, 69223), (319, 66185), (341, 61915), (385, 54839), (427, 49445), (671, 31465), (899, 23485), (1015, 20801), (1085, 19459), (1595, 13237), (1705, 12383), (1769, 11935), (1891, 11165), (2135, 9889), (2233, 9455), (2387, 8845), (3355, 6293), (4495, 4697)]