21101240

素因数分解:

$2^3\times 5^1\times {\mathrm{563}}^1\times {\mathrm{937}}^1$

素因数の和:1511

約数の個数: 32

約数和(自身を含む): 47612880

約数和(自身を除く): 26511640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 563, 937, 1126, 1874, 2252, 2815, 3748, 4504, 4685, 5630, 7496, 9370, 11260, 18740, 22520, 37480, 527531, 1055062, 2110124, 2637655, 4220248, 5275310, 10550620, 21101240]

約数ペア:

[(1, 21101240), (2, 10550620), (4, 5275310), (5, 4220248), (8, 2637655), (10, 2110124), (20, 1055062), (40, 527531), (563, 37480), (937, 22520), (1126, 18740), (1874, 11260), (2252, 9370), (2815, 7496), (3748, 5630), (4504, 4685)]