21240505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{487}}^1$

素因数の和:577

約数の個数: 32

約数和(自身を含む): 30498048

約数和(自身を除く): 9257543

約数列:

[1, 5, 11, 13, 55, 61, 65, 143, 305, 487, 671, 715, 793, 2435, 3355, 3965, 5357, 6331, 8723, 26785, 29707, 31655, 43615, 69641, 148535, 326777, 348205, 386191, 1633885, 1930955, 4248101, 21240505]

約数ペア:

[(1, 21240505), (5, 4248101), (11, 1930955), (13, 1633885), (55, 386191), (61, 348205), (65, 326777), (143, 148535), (305, 69641), (487, 43615), (671, 31655), (715, 29707), (793, 26785), (2435, 8723), (3355, 6331), (3965, 5357)]