21468640

素因数分解:

$2^5\times 5^1\times {\mathrm{109}}^1\times {\mathrm{1231}}^1$

素因数の和:1355

約数の個数: 48

約数和(自身を含む): 51226560

約数和(自身を除く): 29757920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 109, 160, 218, 436, 545, 872, 1090, 1231, 1744, 2180, 2462, 3488, 4360, 4924, 6155, 8720, 9848, 12310, 17440, 19696, 24620, 39392, 49240, 98480, 134179, 196960, 268358, 536716, 670895, 1073432, 1341790, 2146864, 2683580, 4293728, 5367160, 10734320, 21468640]

約数ペア:

[(1, 21468640), (2, 10734320), (4, 5367160), (5, 4293728), (8, 2683580), (10, 2146864), (16, 1341790), (20, 1073432), (32, 670895), (40, 536716), (80, 268358), (109, 196960), (160, 134179), (218, 98480), (436, 49240), (545, 39392), (872, 24620), (1090, 19696), (1231, 17440), (1744, 12310), (2180, 9848), (2462, 8720), (3488, 6155), (4360, 4924)]