21651740

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{389}}^1$

素因数の和:443

約数の個数: 72

約数和(自身を含む): 52284960

約数和(自身を除く): 30633220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 23, 44, 46, 55, 92, 110, 115, 121, 220, 230, 242, 253, 389, 460, 484, 506, 605, 778, 1012, 1210, 1265, 1556, 1945, 2420, 2530, 2783, 3890, 4279, 5060, 5566, 7780, 8558, 8947, 11132, 13915, 17116, 17894, 21395, 27830, 35788, 42790, 44735, 47069, 55660, 85580, 89470, 94138, 98417, 178940, 188276, 196834, 235345, 393668, 470690, 492085, 941380, 984170, 1082587, 1968340, 2165174, 4330348, 5412935, 10825870, 21651740]

約数ペア:

[(1, 21651740), (2, 10825870), (4, 5412935), (5, 4330348), (10, 2165174), (11, 1968340), (20, 1082587), (22, 984170), (23, 941380), (44, 492085), (46, 470690), (55, 393668), (92, 235345), (110, 196834), (115, 188276), (121, 178940), (220, 98417), (230, 94138), (242, 89470), (253, 85580), (389, 55660), (460, 47069), (484, 44735), (506, 42790), (605, 35788), (778, 27830), (1012, 21395), (1210, 17894), (1265, 17116), (1556, 13915), (1945, 11132), (2420, 8947), (2530, 8558), (2783, 7780), (3890, 5566), (4279, 5060)]