21381440

素因数分解:

$2^6\times 5^1\times {\mathrm{109}}^1\times {\mathrm{613}}^1$

素因数の和:739

約数の個数: 56

約数和(自身を含む): 51465480

約数和(自身を除く): 30084040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 109, 160, 218, 320, 436, 545, 613, 872, 1090, 1226, 1744, 2180, 2452, 3065, 3488, 4360, 4904, 6130, 6976, 8720, 9808, 12260, 17440, 19616, 24520, 34880, 39232, 49040, 66817, 98080, 133634, 196160, 267268, 334085, 534536, 668170, 1069072, 1336340, 2138144, 2672680, 4276288, 5345360, 10690720, 21381440]

約数ペア:

[(1, 21381440), (2, 10690720), (4, 5345360), (5, 4276288), (8, 2672680), (10, 2138144), (16, 1336340), (20, 1069072), (32, 668170), (40, 534536), (64, 334085), (80, 267268), (109, 196160), (160, 133634), (218, 98080), (320, 66817), (436, 49040), (545, 39232), (613, 34880), (872, 24520), (1090, 19616), (1226, 17440), (1744, 12260), (2180, 9808), (2452, 8720), (3065, 6976), (3488, 6130), (4360, 4904)]