21891425

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{601}}^1$

素因数の和:689

約数の個数: 24

約数和(自身を含む): 28664832

約数和(自身を除く): 6773407

約数列:

[1, 5, 25, 31, 47, 155, 235, 601, 775, 1175, 1457, 3005, 7285, 15025, 18631, 28247, 36425, 93155, 141235, 465775, 706175, 875657, 4378285, 21891425]

約数ペア:

[(1, 21891425), (5, 4378285), (25, 875657), (31, 706175), (47, 465775), (155, 141235), (235, 93155), (601, 36425), (775, 28247), (1175, 18631), (1457, 15025), (3005, 7285)]