21218972

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:306

約数の個数: 48

約数和(自身を含む): 41664000

約数和(自身を除く): 20445028

約数列:

[1, 2, 4, 19, 23, 38, 46, 61, 76, 92, 122, 199, 244, 398, 437, 796, 874, 1159, 1403, 1748, 2318, 2806, 3781, 4577, 4636, 5612, 7562, 9154, 12139, 15124, 18308, 24278, 26657, 48556, 53314, 86963, 106628, 173926, 230641, 279197, 347852, 461282, 558394, 922564, 1116788, 5304743, 10609486, 21218972]

約数ペア:

[(1, 21218972), (2, 10609486), (4, 5304743), (19, 1116788), (23, 922564), (38, 558394), (46, 461282), (61, 347852), (76, 279197), (92, 230641), (122, 173926), (199, 106628), (244, 86963), (398, 53314), (437, 48556), (796, 26657), (874, 24278), (1159, 18308), (1403, 15124), (1748, 12139), (2318, 9154), (2806, 7562), (3781, 5612), (4577, 4636)]