20985520

素因数分解:

$2^4\times 5^1\times {\mathrm{277}}^1\times {\mathrm{947}}^1$

素因数の和:1237

約数の個数: 40

約数和(自身を含む): 49019184

約数和(自身を除く): 28033664

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 277, 554, 947, 1108, 1385, 1894, 2216, 2770, 3788, 4432, 4735, 5540, 7576, 9470, 11080, 15152, 18940, 22160, 37880, 75760, 262319, 524638, 1049276, 1311595, 2098552, 2623190, 4197104, 5246380, 10492760, 20985520]

約数ペア:

[(1, 20985520), (2, 10492760), (4, 5246380), (5, 4197104), (8, 2623190), (10, 2098552), (16, 1311595), (20, 1049276), (40, 524638), (80, 262319), (277, 75760), (554, 37880), (947, 22160), (1108, 18940), (1385, 15152), (1894, 11080), (2216, 9470), (2770, 7576), (3788, 5540), (4432, 4735)]