21390380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{8839}}^1$

素因数の和:8870

約数の個数: 36

約数和(自身を含む): 49380240

約数和(自身を除く): 27989860

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 121, 220, 242, 484, 605, 1210, 2420, 8839, 17678, 35356, 44195, 88390, 97229, 176780, 194458, 388916, 486145, 972290, 1069519, 1944580, 2139038, 4278076, 5347595, 10695190, 21390380]

約数ペア:

[(1, 21390380), (2, 10695190), (4, 5347595), (5, 4278076), (10, 2139038), (11, 1944580), (20, 1069519), (22, 972290), (44, 486145), (55, 388916), (110, 194458), (121, 176780), (220, 97229), (242, 88390), (484, 44195), (605, 35356), (1210, 17678), (2420, 8839)]