21291280

素因数分解:

$2^4\times 5^1\times {\mathrm{37}}^1\times {\mathrm{7193}}^1$

素因数の和:7243

約数の個数: 40

約数和(自身を含む): 50847192

約数和(自身を除く): 29555912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 37, 40, 74, 80, 148, 185, 296, 370, 592, 740, 1480, 2960, 7193, 14386, 28772, 35965, 57544, 71930, 115088, 143860, 266141, 287720, 532282, 575440, 1064564, 1330705, 2129128, 2661410, 4258256, 5322820, 10645640, 21291280]

約数ペア:

[(1, 21291280), (2, 10645640), (4, 5322820), (5, 4258256), (8, 2661410), (10, 2129128), (16, 1330705), (20, 1064564), (37, 575440), (40, 532282), (74, 287720), (80, 266141), (148, 143860), (185, 115088), (296, 71930), (370, 57544), (592, 35965), (740, 28772), (1480, 14386), (2960, 7193)]