21708940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{977}}^1$

素因数の和:1098

約数の個数: 48

約数和(自身を含む): 50277024

約数和(自身を除く): 28568084

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 101, 110, 202, 220, 404, 505, 977, 1010, 1111, 1954, 2020, 2222, 3908, 4444, 4885, 5555, 9770, 10747, 11110, 19540, 21494, 22220, 42988, 53735, 98677, 107470, 197354, 214940, 394708, 493385, 986770, 1085447, 1973540, 2170894, 4341788, 5427235, 10854470, 21708940]

約数ペア:

[(1, 21708940), (2, 10854470), (4, 5427235), (5, 4341788), (10, 2170894), (11, 1973540), (20, 1085447), (22, 986770), (44, 493385), (55, 394708), (101, 214940), (110, 197354), (202, 107470), (220, 98677), (404, 53735), (505, 42988), (977, 22220), (1010, 21494), (1111, 19540), (1954, 11110), (2020, 10747), (2222, 9770), (3908, 5555), (4444, 4885)]