21897820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2203}}^1$

素因数の和:2290

約数の個数: 48

約数和(自身を含む): 53319168

約数和(自身を除く): 31421348

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2203, 2485, 4406, 4970, 8812, 9940, 11015, 15421, 22030, 30842, 44060, 61684, 77105, 154210, 156413, 308420, 312826, 625652, 782065, 1094891, 1564130, 2189782, 3128260, 4379564, 5474455, 10948910, 21897820]

約数ペア:

[(1, 21897820), (2, 10948910), (4, 5474455), (5, 4379564), (7, 3128260), (10, 2189782), (14, 1564130), (20, 1094891), (28, 782065), (35, 625652), (70, 312826), (71, 308420), (140, 156413), (142, 154210), (284, 77105), (355, 61684), (497, 44060), (710, 30842), (994, 22030), (1420, 15421), (1988, 11015), (2203, 9940), (2485, 8812), (4406, 4970)]