20981090

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{251}}^1\times {\mathrm{643}}^1$

素因数の和:914

約数の個数: 32

約数和(自身を含む): 40896576

約数和(自身を除く): 19915486

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 251, 502, 643, 1255, 1286, 2510, 3215, 3263, 6430, 6526, 8359, 16315, 16718, 32630, 41795, 83590, 161393, 322786, 806965, 1613930, 2098109, 4196218, 10490545, 20981090]

約数ペア:

[(1, 20981090), (2, 10490545), (5, 4196218), (10, 2098109), (13, 1613930), (26, 806965), (65, 322786), (130, 161393), (251, 83590), (502, 41795), (643, 32630), (1255, 16718), (1286, 16315), (2510, 8359), (3215, 6526), (3263, 6430)]