21851225

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{181}}^1\times {\mathrm{439}}^1$

素因数の和:641

約数の個数: 24

約数和(自身を含む): 29789760

約数和(自身を除く): 7938535

約数列:

[1, 5, 11, 25, 55, 181, 275, 439, 905, 1991, 2195, 4525, 4829, 9955, 10975, 24145, 49775, 79459, 120725, 397295, 874049, 1986475, 4370245, 21851225]

約数ペア:

[(1, 21851225), (5, 4370245), (11, 1986475), (25, 874049), (55, 397295), (181, 120725), (275, 79459), (439, 49775), (905, 24145), (1991, 10975), (2195, 9955), (4525, 4829)]