31812781

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{521}}^1$

素因数の和:613

約数の個数: 32

約数和(自身を含む): 43497216

約数和(自身を除く): 11684435

約数列:

[1, 7, 11, 13, 61, 77, 91, 143, 427, 521, 671, 793, 1001, 3647, 4697, 5551, 5731, 6773, 8723, 31781, 40117, 47411, 61061, 74503, 222467, 349591, 413153, 521521, 2447137, 2892071, 4544683, 31812781]

約数ペア:

[(1, 31812781), (7, 4544683), (11, 2892071), (13, 2447137), (61, 521521), (77, 413153), (91, 349591), (143, 222467), (427, 74503), (521, 61061), (671, 47411), (793, 40117), (1001, 31781), (3647, 8723), (4697, 6773), (5551, 5731)]