21861775

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{491}}^1$

素因数の和:651

約数の個数: 24

約数和(自身を含む): 29466864

約数和(自身を除く): 7605089

約数列:

[1, 5, 13, 25, 65, 137, 325, 491, 685, 1781, 2455, 3425, 6383, 8905, 12275, 31915, 44525, 67267, 159575, 336335, 874471, 1681675, 4372355, 21861775]

約数ペア:

[(1, 21861775), (5, 4372355), (13, 1681675), (25, 874471), (65, 336335), (137, 159575), (325, 67267), (491, 44525), (685, 31915), (1781, 12275), (2455, 8905), (3425, 6383)]