21642280

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{487}}^1$

素因数の和:610

約数の個数: 64

約数和(自身を含む): 53758080

約数和(自身を除く): 32115800

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 101, 110, 202, 220, 404, 440, 487, 505, 808, 974, 1010, 1111, 1948, 2020, 2222, 2435, 3896, 4040, 4444, 4870, 5357, 5555, 8888, 9740, 10714, 11110, 19480, 21428, 22220, 26785, 42856, 44440, 49187, 53570, 98374, 107140, 196748, 214280, 245935, 393496, 491870, 541057, 983740, 1082114, 1967480, 2164228, 2705285, 4328456, 5410570, 10821140, 21642280]

約数ペア:

[(1, 21642280), (2, 10821140), (4, 5410570), (5, 4328456), (8, 2705285), (10, 2164228), (11, 1967480), (20, 1082114), (22, 983740), (40, 541057), (44, 491870), (55, 393496), (88, 245935), (101, 214280), (110, 196748), (202, 107140), (220, 98374), (404, 53570), (440, 49187), (487, 44440), (505, 42856), (808, 26785), (974, 22220), (1010, 21428), (1111, 19480), (1948, 11110), (2020, 10714), (2222, 9740), (2435, 8888), (3896, 5555), (4040, 5357), (4444, 4870)]