21028580

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{157}}^1\times {\mathrm{181}}^1$

素因数の和:384

約数の個数: 48

約数和(自身を含む): 45894576

約数和(自身を除く): 24865996

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 148, 157, 181, 185, 314, 362, 370, 628, 724, 740, 785, 905, 1570, 1810, 3140, 3620, 5809, 6697, 11618, 13394, 23236, 26788, 28417, 29045, 33485, 56834, 58090, 66970, 113668, 116180, 133940, 142085, 284170, 568340, 1051429, 2102858, 4205716, 5257145, 10514290, 21028580]

約数ペア:

[(1, 21028580), (2, 10514290), (4, 5257145), (5, 4205716), (10, 2102858), (20, 1051429), (37, 568340), (74, 284170), (148, 142085), (157, 133940), (181, 116180), (185, 113668), (314, 66970), (362, 58090), (370, 56834), (628, 33485), (724, 29045), (740, 28417), (785, 26788), (905, 23236), (1570, 13394), (1810, 11618), (3140, 6697), (3620, 5809)]