21281407

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{101}}^1\times {\mathrm{971}}^1$

素因数の和:1110

約数の個数: 16

約数和(自身を含む): 25380864

約数和(自身を除く): 4099457

約数列:

[1, 7, 31, 101, 217, 707, 971, 3131, 6797, 21917, 30101, 98071, 210707, 686497, 3040201, 21281407]

約数ペア:

[(1, 21281407), (7, 3040201), (31, 686497), (101, 210707), (217, 98071), (707, 30101), (971, 21917), (3131, 6797)]