21871960

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4519}}^1$

素因数の和:4552

約数の個数: 48

約数和(自身を含む): 54104400

約数和(自身を除く): 32232440

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 4519, 4840, 9038, 18076, 22595, 36152, 45190, 49709, 90380, 99418, 180760, 198836, 248545, 397672, 497090, 546799, 994180, 1093598, 1988360, 2187196, 2733995, 4374392, 5467990, 10935980, 21871960]

約数ペア:

[(1, 21871960), (2, 10935980), (4, 5467990), (5, 4374392), (8, 2733995), (10, 2187196), (11, 1988360), (20, 1093598), (22, 994180), (40, 546799), (44, 497090), (55, 397672), (88, 248545), (110, 198836), (121, 180760), (220, 99418), (242, 90380), (440, 49709), (484, 45190), (605, 36152), (968, 22595), (1210, 18076), (2420, 9038), (4519, 4840)]