21400905

素因数分解:

$3^1\times 5^1\times {\mathrm{509}}^1\times {\mathrm{2803}}^1$

素因数の和:3320

約数の個数: 16

約数和(自身を含む): 34320960

約数和(自身を除く): 12920055

約数列:

[1, 3, 5, 15, 509, 1527, 2545, 2803, 7635, 8409, 14015, 42045, 1426727, 4280181, 7133635, 21400905]

約数ペア:

[(1, 21400905), (3, 7133635), (5, 4280181), (15, 1426727), (509, 42045), (1527, 14015), (2545, 8409), (2803, 7635)]