21909980

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{17959}}^1$

素因数の和:18029

約数の個数: 24

約数和(自身を含む): 46767840

約数和(自身を除く): 24857860

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 17959, 35918, 71836, 89795, 179590, 359180, 1095499, 2190998, 4381996, 5477495, 10954990, 21909980]

約数ペア:

[(1, 21909980), (2, 10954990), (4, 5477495), (5, 4381996), (10, 2190998), (20, 1095499), (61, 359180), (122, 179590), (244, 89795), (305, 71836), (610, 35918), (1220, 17959)]