21704720

素因数分解:

$2^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{2797}}^1$

素因数の和:2907

約数の個数: 40

約数和(自身を含む): 51001944

約数和(自身を除く): 29297224

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 2797, 3880, 5594, 7760, 11188, 13985, 22376, 27970, 44752, 55940, 111880, 223760, 271309, 542618, 1085236, 1356545, 2170472, 2713090, 4340944, 5426180, 10852360, 21704720]

約数ペア:

[(1, 21704720), (2, 10852360), (4, 5426180), (5, 4340944), (8, 2713090), (10, 2170472), (16, 1356545), (20, 1085236), (40, 542618), (80, 271309), (97, 223760), (194, 111880), (388, 55940), (485, 44752), (776, 27970), (970, 22376), (1552, 13985), (1940, 11188), (2797, 7760), (3880, 5594)]