21518185

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{181}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 29352960

約数和(自身を除く): 7834775

約数列:

[1, 5, 13, 31, 59, 65, 155, 181, 295, 403, 767, 905, 1829, 2015, 2353, 3835, 5611, 9145, 10679, 11765, 23777, 28055, 53395, 72943, 118885, 138827, 331049, 364715, 694135, 1655245, 4303637, 21518185]

約数ペア:

[(1, 21518185), (5, 4303637), (13, 1655245), (31, 694135), (59, 364715), (65, 331049), (155, 138827), (181, 118885), (295, 72943), (403, 53395), (767, 28055), (905, 23777), (1829, 11765), (2015, 10679), (2353, 9145), (3835, 5611)]