21721020

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{8419}}^1$

素因数の和:8474

約数の個数: 48

約数和(自身を含む): 62240640

約数和(自身を除く): 40519620

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 43, 60, 86, 129, 172, 215, 258, 430, 516, 645, 860, 1290, 2580, 8419, 16838, 25257, 33676, 42095, 50514, 84190, 101028, 126285, 168380, 252570, 362017, 505140, 724034, 1086051, 1448068, 1810085, 2172102, 3620170, 4344204, 5430255, 7240340, 10860510, 21721020]

約数ペア:

[(1, 21721020), (2, 10860510), (3, 7240340), (4, 5430255), (5, 4344204), (6, 3620170), (10, 2172102), (12, 1810085), (15, 1448068), (20, 1086051), (30, 724034), (43, 505140), (60, 362017), (86, 252570), (129, 168380), (172, 126285), (215, 101028), (258, 84190), (430, 50514), (516, 42095), (645, 33676), (860, 25257), (1290, 16838), (2580, 8419)]