21660520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{77359}}^1$

素因数の和:77377

約数の個数: 32

約数和(自身を含む): 55699200

約数和(自身を除く): 34038680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 77359, 154718, 309436, 386795, 541513, 618872, 773590, 1083026, 1547180, 2166052, 2707565, 3094360, 4332104, 5415130, 10830260, 21660520]

約数ペア:

[(1, 21660520), (2, 10830260), (4, 5415130), (5, 4332104), (7, 3094360), (8, 2707565), (10, 2166052), (14, 1547180), (20, 1083026), (28, 773590), (35, 618872), (40, 541513), (56, 386795), (70, 309436), (140, 154718), (280, 77359)]