21781040

素因数分解:

$2^4\times 5^1\times {\mathrm{272263}}^1$

素因数の和:272276

約数の個数: 20

約数和(自身を含む): 50641104

約数和(自身を除く): 28860064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272263, 544526, 1089052, 1361315, 2178104, 2722630, 4356208, 5445260, 10890520, 21781040]

約数ペア:

[(1, 21781040), (2, 10890520), (4, 5445260), (5, 4356208), (8, 2722630), (10, 2178104), (16, 1361315), (20, 1089052), (40, 544526), (80, 272263)]