21136240

素因数分解:

$2^4\times 5^1\times {\mathrm{431}}^1\times {\mathrm{613}}^1$

素因数の和:1057

約数の個数: 40

約数和(自身を含む): 49336128

約数和(自身を除く): 28199888

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 431, 613, 862, 1226, 1724, 2155, 2452, 3065, 3448, 4310, 4904, 6130, 6896, 8620, 9808, 12260, 17240, 24520, 34480, 49040, 264203, 528406, 1056812, 1321015, 2113624, 2642030, 4227248, 5284060, 10568120, 21136240]

約数ペア:

[(1, 21136240), (2, 10568120), (4, 5284060), (5, 4227248), (8, 2642030), (10, 2113624), (16, 1321015), (20, 1056812), (40, 528406), (80, 264203), (431, 49040), (613, 34480), (862, 24520), (1226, 17240), (1724, 12260), (2155, 9808), (2452, 8620), (3065, 6896), (3448, 6130), (4310, 4904)]