18880004

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{2539}}^1$

素因数の和:2580

約数の個数: 36

約数和(自身を含む): 39044880

約数和(自身を除く): 20164876

約数列:

[1, 2, 4, 11, 13, 22, 26, 44, 52, 143, 169, 286, 338, 572, 676, 1859, 2539, 3718, 5078, 7436, 10156, 27929, 33007, 55858, 66014, 111716, 132028, 363077, 429091, 726154, 858182, 1452308, 1716364, 4720001, 9440002, 18880004]

約数ペア:

[(1, 18880004), (2, 9440002), (4, 4720001), (11, 1716364), (13, 1452308), (22, 858182), (26, 726154), (44, 429091), (52, 363077), (143, 132028), (169, 111716), (286, 66014), (338, 55858), (572, 33007), (676, 27929), (1859, 10156), (2539, 7436), (3718, 5078)]