21407840

素因数分解:

$2^5\times 5^1\times {\mathrm{67}}^1\times {\mathrm{1997}}^1$

素因数の和:2079

約数の個数: 48

約数和(自身を含む): 51356592

約数和(自身を除く): 29948752

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 67, 80, 134, 160, 268, 335, 536, 670, 1072, 1340, 1997, 2144, 2680, 3994, 5360, 7988, 9985, 10720, 15976, 19970, 31952, 39940, 63904, 79880, 133799, 159760, 267598, 319520, 535196, 668995, 1070392, 1337990, 2140784, 2675980, 4281568, 5351960, 10703920, 21407840]

約数ペア:

[(1, 21407840), (2, 10703920), (4, 5351960), (5, 4281568), (8, 2675980), (10, 2140784), (16, 1337990), (20, 1070392), (32, 668995), (40, 535196), (67, 319520), (80, 267598), (134, 159760), (160, 133799), (268, 79880), (335, 63904), (536, 39940), (670, 31952), (1072, 19970), (1340, 15976), (1997, 10720), (2144, 9985), (2680, 7988), (3994, 5360)]