21521812

素因数分解:

$2^2\times {\mathrm{13}}^3\times {\mathrm{31}}^1\times {\mathrm{79}}^1$

素因数の和:153

約数の個数: 48

約数和(自身を含む): 42649600

約数和(自身を除く): 21127788

約数列:

[1, 2, 4, 13, 26, 31, 52, 62, 79, 124, 158, 169, 316, 338, 403, 676, 806, 1027, 1612, 2054, 2197, 2449, 4108, 4394, 4898, 5239, 8788, 9796, 10478, 13351, 20956, 26702, 31837, 53404, 63674, 68107, 127348, 136214, 173563, 272428, 347126, 413881, 694252, 827762, 1655524, 5380453, 10760906, 21521812]

約数ペア:

[(1, 21521812), (2, 10760906), (4, 5380453), (13, 1655524), (26, 827762), (31, 694252), (52, 413881), (62, 347126), (79, 272428), (124, 173563), (158, 136214), (169, 127348), (316, 68107), (338, 63674), (403, 53404), (676, 31837), (806, 26702), (1027, 20956), (1612, 13351), (2054, 10478), (2197, 9796), (2449, 8788), (4108, 5239), (4394, 4898)]