20210915

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{1571}}^1$

素因数の和:1690

約数の個数: 16

約数和(自身を含む): 25353216

約数和(自身を除く): 5142301

約数列:

[1, 5, 31, 83, 155, 415, 1571, 2573, 7855, 12865, 48701, 130393, 243505, 651965, 4042183, 20210915]

約数ペア:

[(1, 20210915), (5, 4042183), (31, 651965), (83, 243505), (155, 130393), (415, 48701), (1571, 12865), (2573, 7855)]