21128445

素因数分解:

$3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4013}}^1$

素因数の和:4043

約数の個数: 40

約数和(自身を含む): 40798296

約数和(自身を除く): 19669851

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 81, 117, 135, 195, 351, 405, 585, 1053, 1755, 4013, 5265, 12039, 20065, 36117, 52169, 60195, 108351, 156507, 180585, 260845, 325053, 469521, 541755, 782535, 1408563, 1625265, 2347605, 4225689, 7042815, 21128445]

約数ペア:

[(1, 21128445), (3, 7042815), (5, 4225689), (9, 2347605), (13, 1625265), (15, 1408563), (27, 782535), (39, 541755), (45, 469521), (65, 325053), (81, 260845), (117, 180585), (135, 156507), (195, 108351), (351, 60195), (405, 52169), (585, 36117), (1053, 20065), (1755, 12039), (4013, 5265)]