21495790

素因数分解:

$2^1\times 5^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1\times {\mathrm{269}}^1$

素因数の和:468

約数の個数: 32

約数和(自身を含む): 39774240

約数和(自身を除く): 18278450

約数列:

[1, 2, 5, 10, 61, 122, 131, 262, 269, 305, 538, 610, 655, 1310, 1345, 2690, 7991, 15982, 16409, 32818, 35239, 39955, 70478, 79910, 82045, 164090, 176195, 352390, 2149579, 4299158, 10747895, 21495790]

約数ペア:

[(1, 21495790), (2, 10747895), (5, 4299158), (10, 2149579), (61, 352390), (122, 176195), (131, 164090), (262, 82045), (269, 79910), (305, 70478), (538, 39955), (610, 35239), (655, 32818), (1310, 16409), (1345, 15982), (2690, 7991)]