20815431

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4013}}^1$

素因数の和:4055

約数の個数: 32

約数和(自身を含む): 35965440

約数和(自身を除く): 15150009

約数列:

[1, 3, 7, 13, 19, 21, 39, 57, 91, 133, 247, 273, 399, 741, 1729, 4013, 5187, 12039, 28091, 52169, 76247, 84273, 156507, 228741, 365183, 533729, 991211, 1095549, 1601187, 2973633, 6938477, 20815431]

約数ペア:

[(1, 20815431), (3, 6938477), (7, 2973633), (13, 1601187), (19, 1095549), (21, 991211), (39, 533729), (57, 365183), (91, 228741), (133, 156507), (247, 84273), (273, 76247), (399, 52169), (741, 28091), (1729, 12039), (4013, 5187)]