20646985

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{151}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 27578880

約数和(自身を除く): 6931895

約数列:

[1, 5, 23, 29, 41, 115, 145, 151, 205, 667, 755, 943, 1189, 3335, 3473, 4379, 4715, 5945, 6191, 17365, 21895, 27347, 30955, 100717, 136735, 142393, 179539, 503585, 711965, 897695, 4129397, 20646985]

約数ペア:

[(1, 20646985), (5, 4129397), (23, 897695), (29, 711965), (41, 503585), (115, 179539), (145, 142393), (151, 136735), (205, 100717), (667, 30955), (755, 27347), (943, 21895), (1189, 17365), (3335, 6191), (3473, 5945), (4379, 4715)]