21107125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{419}}^1$

素因数の和:478

約数の個数: 32

約数和(自身を含む): 29352960

約数和(自身を除く): 8245835

約数列:

[1, 5, 13, 25, 31, 65, 125, 155, 325, 403, 419, 775, 1625, 2015, 2095, 3875, 5447, 10075, 10475, 12989, 27235, 50375, 52375, 64945, 136175, 168857, 324725, 680875, 844285, 1623625, 4221425, 21107125]

約数ペア:

[(1, 21107125), (5, 4221425), (13, 1623625), (25, 844285), (31, 680875), (65, 324725), (125, 168857), (155, 136175), (325, 64945), (403, 52375), (419, 50375), (775, 27235), (1625, 12989), (2015, 10475), (2095, 10075), (3875, 5447)]