21009885

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{661}}^1$

素因数の和:845

約数の個数: 32

約数和(自身を含む): 36478848

約数和(自身を除く): 15468963

約数列:

[1, 3, 5, 13, 15, 39, 65, 163, 195, 489, 661, 815, 1983, 2119, 2445, 3305, 6357, 8593, 9915, 10595, 25779, 31785, 42965, 107743, 128895, 323229, 538715, 1400659, 1616145, 4201977, 7003295, 21009885]

約数ペア:

[(1, 21009885), (3, 7003295), (5, 4201977), (13, 1616145), (15, 1400659), (39, 538715), (65, 323229), (163, 128895), (195, 107743), (489, 42965), (661, 31785), (815, 25779), (1983, 10595), (2119, 9915), (2445, 8593), (3305, 6357)]