20815275

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{577}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 38129504

約数和(自身を除く): 17314229

約数列:

[1, 3, 5, 13, 15, 25, 37, 39, 65, 75, 111, 185, 195, 325, 481, 555, 577, 925, 975, 1443, 1731, 2405, 2775, 2885, 7215, 7501, 8655, 12025, 14425, 21349, 22503, 36075, 37505, 43275, 64047, 106745, 112515, 187525, 277537, 320235, 533725, 562575, 832611, 1387685, 1601175, 4163055, 6938425, 20815275]

約数ペア:

[(1, 20815275), (3, 6938425), (5, 4163055), (13, 1601175), (15, 1387685), (25, 832611), (37, 562575), (39, 533725), (65, 320235), (75, 277537), (111, 187525), (185, 112515), (195, 106745), (325, 64047), (481, 43275), (555, 37505), (577, 36075), (925, 22503), (975, 21349), (1443, 14425), (1731, 12025), (2405, 8655), (2775, 7501), (2885, 7215)]