21137505

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1\times {\mathrm{347}}^1$

素因数の和:517

約数の個数: 32

約数和(自身を含む): 35278848

約数和(自身を除く): 14141343

約数列:

[1, 3, 5, 15, 31, 93, 131, 155, 347, 393, 465, 655, 1041, 1735, 1965, 4061, 5205, 10757, 12183, 20305, 32271, 45457, 53785, 60915, 136371, 161355, 227285, 681855, 1409167, 4227501, 7045835, 21137505]

約数ペア:

[(1, 21137505), (3, 7045835), (5, 4227501), (15, 1409167), (31, 681855), (93, 227285), (131, 161355), (155, 136371), (347, 60915), (393, 53785), (465, 45457), (655, 32271), (1041, 20305), (1735, 12183), (1965, 10757), (4061, 5205)]