21691475

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2153}}^1$

素因数の和:2207

約数の個数: 24

約数和(自身を含む): 29914752

約数和(自身を除く): 8223277

約数列:

[1, 5, 13, 25, 31, 65, 155, 325, 403, 775, 2015, 2153, 10075, 10765, 27989, 53825, 66743, 139945, 333715, 699725, 867659, 1668575, 4338295, 21691475]

約数ペア:

[(1, 21691475), (5, 4338295), (13, 1668575), (25, 867659), (31, 699725), (65, 333715), (155, 139945), (325, 66743), (403, 53825), (775, 27989), (2015, 10765), (2153, 10075)]