21000805

素因数分解:

$5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{4027}}^1$

素因数の和:4188

約数の個数: 16

約数和(自身を含む): 29001600

約数和(自身を除く): 8000795

約数列:

[1, 5, 7, 35, 149, 745, 1043, 4027, 5215, 20135, 28189, 140945, 600023, 3000115, 4200161, 21000805]

約数ペア:

[(1, 21000805), (5, 4200161), (7, 3000115), (35, 600023), (149, 140945), (745, 28189), (1043, 20135), (4027, 5215)]