21506415

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{857}}^1$

素因数の和:1111

約数の個数: 32

約数和(自身を含む): 39536640

約数和(自身を除く): 18030225

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 239, 717, 857, 1195, 1673, 2571, 3585, 4285, 5019, 5999, 8365, 12855, 17997, 25095, 29995, 89985, 204823, 614469, 1024115, 1433761, 3072345, 4301283, 7168805, 21506415]

約数ペア:

[(1, 21506415), (3, 7168805), (5, 4301283), (7, 3072345), (15, 1433761), (21, 1024115), (35, 614469), (105, 204823), (239, 89985), (717, 29995), (857, 25095), (1195, 17997), (1673, 12855), (2571, 8365), (3585, 5999), (4285, 5019)]