21403788

素因数分解:

$2^2\times 3^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{409}}^1$

素因数の和:519

約数の個数: 72

約数和(自身を含む): 58892400

約数和(自身を除く): 37488612

約数列:

[1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 49, 84, 89, 98, 147, 178, 196, 267, 294, 356, 409, 534, 588, 623, 818, 1068, 1227, 1246, 1636, 1869, 2454, 2492, 2863, 3738, 4361, 4908, 5726, 7476, 8589, 8722, 11452, 13083, 17178, 17444, 20041, 26166, 34356, 36401, 40082, 52332, 60123, 72802, 80164, 109203, 120246, 145604, 218406, 240492, 254807, 436812, 509614, 764421, 1019228, 1528842, 1783649, 3057684, 3567298, 5350947, 7134596, 10701894, 21403788]

約数ペア:

[(1, 21403788), (2, 10701894), (3, 7134596), (4, 5350947), (6, 3567298), (7, 3057684), (12, 1783649), (14, 1528842), (21, 1019228), (28, 764421), (42, 509614), (49, 436812), (84, 254807), (89, 240492), (98, 218406), (147, 145604), (178, 120246), (196, 109203), (267, 80164), (294, 72802), (356, 60123), (409, 52332), (534, 40082), (588, 36401), (623, 34356), (818, 26166), (1068, 20041), (1227, 17444), (1246, 17178), (1636, 13083), (1869, 11452), (2454, 8722), (2492, 8589), (2863, 7476), (3738, 5726), (4361, 4908)]