21191960

素因数分解:

$2^3\times 5^1\times {\mathrm{523}}^1\times {\mathrm{1013}}^1$

素因数の和:1547

約数の個数: 32

約数和(自身を含む): 47820240

約数和(自身を除く): 26628280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 523, 1013, 1046, 2026, 2092, 2615, 4052, 4184, 5065, 5230, 8104, 10130, 10460, 20260, 20920, 40520, 529799, 1059598, 2119196, 2648995, 4238392, 5297990, 10595980, 21191960]

約数ペア:

[(1, 21191960), (2, 10595980), (4, 5297990), (5, 4238392), (8, 2648995), (10, 2119196), (20, 1059598), (40, 529799), (523, 40520), (1013, 20920), (1046, 20260), (2026, 10460), (2092, 10130), (2615, 8104), (4052, 5230), (4184, 5065)]