21313520

素因数分解:

$2^4\times 5^1\times {\mathrm{263}}^1\times {\mathrm{1013}}^1$

素因数の和:1289

約数の個数: 40

約数和(自身を含む): 49791456

約数和(自身を除く): 28477936

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263, 526, 1013, 1052, 1315, 2026, 2104, 2630, 4052, 4208, 5065, 5260, 8104, 10130, 10520, 16208, 20260, 21040, 40520, 81040, 266419, 532838, 1065676, 1332095, 2131352, 2664190, 4262704, 5328380, 10656760, 21313520]

約数ペア:

[(1, 21313520), (2, 10656760), (4, 5328380), (5, 4262704), (8, 2664190), (10, 2131352), (16, 1332095), (20, 1065676), (40, 532838), (80, 266419), (263, 81040), (526, 40520), (1013, 21040), (1052, 20260), (1315, 16208), (2026, 10520), (2104, 10130), (2630, 8104), (4052, 5260), (4208, 5065)]