21147940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{991}}^1$

素因数の和:1108

約数の個数: 48

約数和(自身を含む): 48996864

約数和(自身を除く): 27848924

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 97, 110, 194, 220, 388, 485, 970, 991, 1067, 1940, 1982, 2134, 3964, 4268, 4955, 5335, 9910, 10670, 10901, 19820, 21340, 21802, 43604, 54505, 96127, 109010, 192254, 218020, 384508, 480635, 961270, 1057397, 1922540, 2114794, 4229588, 5286985, 10573970, 21147940]

約数ペア:

[(1, 21147940), (2, 10573970), (4, 5286985), (5, 4229588), (10, 2114794), (11, 1922540), (20, 1057397), (22, 961270), (44, 480635), (55, 384508), (97, 218020), (110, 192254), (194, 109010), (220, 96127), (388, 54505), (485, 43604), (970, 21802), (991, 21340), (1067, 19820), (1940, 10901), (1982, 10670), (2134, 9910), (3964, 5335), (4268, 4955)]