21101380

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{97}}^1\times {\mathrm{149}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 45687600

約数和(自身を除く): 24586220

約数列:

[1, 2, 4, 5, 10, 20, 73, 97, 146, 149, 194, 292, 298, 365, 388, 485, 596, 730, 745, 970, 1460, 1490, 1940, 2980, 7081, 10877, 14162, 14453, 21754, 28324, 28906, 35405, 43508, 54385, 57812, 70810, 72265, 108770, 141620, 144530, 217540, 289060, 1055069, 2110138, 4220276, 5275345, 10550690, 21101380]

約数ペア:

[(1, 21101380), (2, 10550690), (4, 5275345), (5, 4220276), (10, 2110138), (20, 1055069), (73, 289060), (97, 217540), (146, 144530), (149, 141620), (194, 108770), (292, 72265), (298, 70810), (365, 57812), (388, 54385), (485, 43508), (596, 35405), (730, 28906), (745, 28324), (970, 21754), (1460, 14453), (1490, 14162), (1940, 10877), (2980, 7081)]