20398945

素因数分解:

$5^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{599}}^1$

素因数の和:757

約数の個数: 24

約数和(自身を含む): 28728000

約数和(自身を除く): 8329055

約数列:

[1, 5, 7, 35, 49, 139, 245, 599, 695, 973, 2995, 4193, 4865, 6811, 20965, 29351, 34055, 83261, 146755, 416305, 582827, 2914135, 4079789, 20398945]

約数ペア:

[(1, 20398945), (5, 4079789), (7, 2914135), (35, 582827), (49, 416305), (139, 146755), (245, 83261), (599, 34055), (695, 29351), (973, 20965), (2995, 6811), (4193, 4865)]