21125415

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{181}}^1\times {\mathrm{251}}^1$

素因数の和:471

約数の個数: 32

約数和(自身を含む): 35223552

約数和(自身を除く): 14098137

約数列:

[1, 3, 5, 15, 31, 93, 155, 181, 251, 465, 543, 753, 905, 1255, 2715, 3765, 5611, 7781, 16833, 23343, 28055, 38905, 45431, 84165, 116715, 136293, 227155, 681465, 1408361, 4225083, 7041805, 21125415]

約数ペア:

[(1, 21125415), (3, 7041805), (5, 4225083), (15, 1408361), (31, 681465), (93, 227155), (155, 136293), (181, 116715), (251, 84165), (465, 45431), (543, 38905), (753, 28055), (905, 23343), (1255, 16833), (2715, 7781), (3765, 5611)]