85898980

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1\times {\mathrm{389}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 184831920

約数和(自身を除く): 98932940

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 181, 244, 305, 362, 389, 610, 724, 778, 905, 1220, 1556, 1810, 1945, 3620, 3890, 7780, 11041, 22082, 23729, 44164, 47458, 55205, 70409, 94916, 110410, 118645, 140818, 220820, 237290, 281636, 352045, 474580, 704090, 1408180, 4294949, 8589898, 17179796, 21474745, 42949490, 85898980]

約数ペア:

[(1, 85898980), (2, 42949490), (4, 21474745), (5, 17179796), (10, 8589898), (20, 4294949), (61, 1408180), (122, 704090), (181, 474580), (244, 352045), (305, 281636), (362, 237290), (389, 220820), (610, 140818), (724, 118645), (778, 110410), (905, 94916), (1220, 70409), (1556, 55205), (1810, 47458), (1945, 44164), (3620, 23729), (3890, 22082), (7780, 11041)]