21365720

素因数分解:

$2^3\times 5^1\times {\mathrm{691}}^1\times {\mathrm{773}}^1$

素因数の和:1475

約数の個数: 32

約数和(自身を含む): 48204720

約数和(自身を除く): 26839000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 691, 773, 1382, 1546, 2764, 3092, 3455, 3865, 5528, 6184, 6910, 7730, 13820, 15460, 27640, 30920, 534143, 1068286, 2136572, 2670715, 4273144, 5341430, 10682860, 21365720]

約数ペア:

[(1, 21365720), (2, 10682860), (4, 5341430), (5, 4273144), (8, 2670715), (10, 2136572), (20, 1068286), (40, 534143), (691, 30920), (773, 27640), (1382, 15460), (1546, 13820), (2764, 7730), (3092, 6910), (3455, 6184), (3865, 5528)]