21335480

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{419}}^1$

素因数の和:516

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 30072520

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 67, 76, 95, 134, 152, 190, 268, 335, 380, 419, 536, 670, 760, 838, 1273, 1340, 1676, 2095, 2546, 2680, 3352, 4190, 5092, 6365, 7961, 8380, 10184, 12730, 15922, 16760, 25460, 28073, 31844, 39805, 50920, 56146, 63688, 79610, 112292, 140365, 159220, 224584, 280730, 318440, 533387, 561460, 1066774, 1122920, 2133548, 2666935, 4267096, 5333870, 10667740, 21335480]

約数ペア:

[(1, 21335480), (2, 10667740), (4, 5333870), (5, 4267096), (8, 2666935), (10, 2133548), (19, 1122920), (20, 1066774), (38, 561460), (40, 533387), (67, 318440), (76, 280730), (95, 224584), (134, 159220), (152, 140365), (190, 112292), (268, 79610), (335, 63688), (380, 56146), (419, 50920), (536, 39805), (670, 31844), (760, 28073), (838, 25460), (1273, 16760), (1340, 15922), (1676, 12730), (2095, 10184), (2546, 8380), (2680, 7961), (3352, 6365), (4190, 5092)]