21603985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{157}}^1$

素因数の和:277

約数の個数: 32

約数和(自身を含む): 29463840

約数和(自身を除く): 7859855

約数列:

[1, 5, 13, 29, 65, 73, 145, 157, 365, 377, 785, 949, 1885, 2041, 2117, 4553, 4745, 10205, 10585, 11461, 22765, 27521, 57305, 59189, 137605, 148993, 295945, 332369, 744965, 1661845, 4320797, 21603985]

約数ペア:

[(1, 21603985), (5, 4320797), (13, 1661845), (29, 744965), (65, 332369), (73, 295945), (145, 148993), (157, 137605), (365, 59189), (377, 57305), (785, 27521), (949, 22765), (1885, 11461), (2041, 10585), (2117, 10205), (4553, 4745)]