21980725

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{1439}}^1$

素因数の和:1509

約数の個数: 24

約数和(自身を含む): 29998080

約数和(自身を除く): 8017355

約数列:

[1, 5, 13, 25, 47, 65, 235, 325, 611, 1175, 1439, 3055, 7195, 15275, 18707, 35975, 67633, 93535, 338165, 467675, 879229, 1690825, 4396145, 21980725]

約数ペア:

[(1, 21980725), (5, 4396145), (13, 1690825), (25, 879229), (47, 467675), (65, 338165), (235, 93535), (325, 67633), (611, 35975), (1175, 18707), (1439, 15275), (3055, 7195)]