21781395

素因数分解:

$3^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{3083}}^1$

素因数の和:3251

約数の個数: 24

約数和(自身を含む): 38007216

約数和(自身を除く): 16225821

約数列:

[1, 3, 5, 9, 15, 45, 157, 471, 785, 1413, 2355, 3083, 7065, 9249, 15415, 27747, 46245, 138735, 484031, 1452093, 2420155, 4356279, 7260465, 21781395]

約数ペア:

[(1, 21781395), (3, 7260465), (5, 4356279), (9, 2420155), (15, 1452093), (45, 484031), (157, 138735), (471, 46245), (785, 27747), (1413, 15415), (2355, 9249), (3083, 7065)]