21008728

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{379}}^1$

素因数の和:452

約数の個数: 48

約数和(自身を含む): 43810200

約数和(自身を除く): 22801472

約数列:

[1, 2, 4, 8, 13, 26, 41, 52, 82, 104, 164, 169, 328, 338, 379, 533, 676, 758, 1066, 1352, 1516, 2132, 3032, 4264, 4927, 6929, 9854, 13858, 15539, 19708, 27716, 31078, 39416, 55432, 62156, 64051, 124312, 128102, 202007, 256204, 404014, 512408, 808028, 1616056, 2626091, 5252182, 10504364, 21008728]

約数ペア:

[(1, 21008728), (2, 10504364), (4, 5252182), (8, 2626091), (13, 1616056), (26, 808028), (41, 512408), (52, 404014), (82, 256204), (104, 202007), (164, 128102), (169, 124312), (328, 64051), (338, 62156), (379, 55432), (533, 39416), (676, 31078), (758, 27716), (1066, 19708), (1352, 15539), (1516, 13858), (2132, 9854), (3032, 6929), (4264, 4927)]