20209640

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{1997}}^1$

素因数の和:2042

約数の個数: 64

約数和(自身を含む): 51788160

約数和(自身を除く): 31578520

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 23, 40, 44, 46, 55, 88, 92, 110, 115, 184, 220, 230, 253, 440, 460, 506, 920, 1012, 1265, 1997, 2024, 2530, 3994, 5060, 7988, 9985, 10120, 15976, 19970, 21967, 39940, 43934, 45931, 79880, 87868, 91862, 109835, 175736, 183724, 219670, 229655, 367448, 439340, 459310, 505241, 878680, 918620, 1010482, 1837240, 2020964, 2526205, 4041928, 5052410, 10104820, 20209640]

約数ペア:

[(1, 20209640), (2, 10104820), (4, 5052410), (5, 4041928), (8, 2526205), (10, 2020964), (11, 1837240), (20, 1010482), (22, 918620), (23, 878680), (40, 505241), (44, 459310), (46, 439340), (55, 367448), (88, 229655), (92, 219670), (110, 183724), (115, 175736), (184, 109835), (220, 91862), (230, 87868), (253, 79880), (440, 45931), (460, 43934), (506, 39940), (920, 21967), (1012, 19970), (1265, 15976), (1997, 10120), (2024, 9985), (2530, 7988), (3994, 5060)]