20742760

素因数分解:

$2^3\times 5^1\times {\mathrm{641}}^1\times {\mathrm{809}}^1$

素因数の和:1461

約数の個数: 32

約数和(自身を含む): 46801800

約数和(自身を除く): 26059040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 641, 809, 1282, 1618, 2564, 3205, 3236, 4045, 5128, 6410, 6472, 8090, 12820, 16180, 25640, 32360, 518569, 1037138, 2074276, 2592845, 4148552, 5185690, 10371380, 20742760]

約数ペア:

[(1, 20742760), (2, 10371380), (4, 5185690), (5, 4148552), (8, 2592845), (10, 2074276), (20, 1037138), (40, 518569), (641, 32360), (809, 25640), (1282, 16180), (1618, 12820), (2564, 8090), (3205, 6472), (3236, 6410), (4045, 5128)]