19780784

素因数分解:

$2^4\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{479}}^1$

素因数の和:605

約数の個数: 40

約数和(自身を含む): 40176000

約数和(自身を除く): 20395216

約数列:

[1, 2, 4, 8, 16, 29, 58, 89, 116, 178, 232, 356, 464, 479, 712, 958, 1424, 1916, 2581, 3832, 5162, 7664, 10324, 13891, 20648, 27782, 41296, 42631, 55564, 85262, 111128, 170524, 222256, 341048, 682096, 1236299, 2472598, 4945196, 9890392, 19780784]

約数ペア:

[(1, 19780784), (2, 9890392), (4, 4945196), (8, 2472598), (16, 1236299), (29, 682096), (58, 341048), (89, 222256), (116, 170524), (178, 111128), (232, 85262), (356, 55564), (464, 42631), (479, 41296), (712, 27782), (958, 20648), (1424, 13891), (1916, 10324), (2581, 7664), (3832, 5162)]