21281325

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{73}}^1$

素因数の和:135

約数の個数: 72

約数和(自身を含む): 40300992

約数和(自身を除く): 19019667

約数列:

[1, 3, 5, 13, 15, 23, 25, 39, 65, 69, 73, 75, 115, 169, 195, 219, 299, 325, 345, 365, 507, 575, 845, 897, 949, 975, 1095, 1495, 1679, 1725, 1825, 2535, 2847, 3887, 4225, 4485, 4745, 5037, 5475, 7475, 8395, 11661, 12337, 12675, 14235, 19435, 21827, 22425, 23725, 25185, 37011, 41975, 58305, 61685, 65481, 71175, 97175, 109135, 125925, 185055, 283751, 291525, 308425, 327405, 545675, 851253, 925275, 1418755, 1637025, 4256265, 7093775, 21281325]

約数ペア:

[(1, 21281325), (3, 7093775), (5, 4256265), (13, 1637025), (15, 1418755), (23, 925275), (25, 851253), (39, 545675), (65, 327405), (69, 308425), (73, 291525), (75, 283751), (115, 185055), (169, 125925), (195, 109135), (219, 97175), (299, 71175), (325, 65481), (345, 61685), (365, 58305), (507, 41975), (575, 37011), (845, 25185), (897, 23725), (949, 22425), (975, 21827), (1095, 19435), (1495, 14235), (1679, 12675), (1725, 12337), (1825, 11661), (2535, 8395), (2847, 7475), (3887, 5475), (4225, 5037), (4485, 4745)]