21120125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{317}}^1$

素因数の和:386

約数の個数: 32

約数和(自身を含む): 29169504

約数和(自身を除く): 8049379

約数列:

[1, 5, 13, 25, 41, 65, 125, 205, 317, 325, 533, 1025, 1585, 1625, 2665, 4121, 5125, 7925, 12997, 13325, 20605, 39625, 64985, 66625, 103025, 168961, 324925, 515125, 844805, 1624625, 4224025, 21120125]

約数ペア:

[(1, 21120125), (5, 4224025), (13, 1624625), (25, 844805), (41, 515125), (65, 324925), (125, 168961), (205, 103025), (317, 66625), (325, 64985), (533, 39625), (1025, 20605), (1585, 13325), (1625, 12997), (2665, 7925), (4121, 5125)]