821221.0000000

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{347}}^1$

素因数の和:437

約数の個数: 32

約数和(自身を含む): 5261760

約数和(自身を除く): 2699512

約数列:

[1, 2, 4, 8, 13, 26, 52, 71, 104, 142, 284, 347, 568, 694, 923, 1388, 1846, 2776, 3692, 4511, 7384, 9022, 18044, 24637, 36088, 49274, 98548, 197096, 320281, 640562, 1281124, 2562248]

約数ペア:

[(1, 2562248), (2, 1281124), (4, 640562), (8, 320281), (13, 197096), (26, 98548), (52, 49274), (71, 36088), (104, 24637), (142, 18044), (284, 9022), (347, 7384), (568, 4511), (694, 3692), (923, 2776), (1388, 1846)]