21660160

素因数分解:

$2^9\times 5^1\times {\mathrm{8461}}^1$

素因数の和:8484

約数の個数: 40

約数和(自身を含む): 51939756

約数和(自身を除く): 30279596

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8461, 16922, 33844, 42305, 67688, 84610, 135376, 169220, 270752, 338440, 541504, 676880, 1083008, 1353760, 2166016, 2707520, 4332032, 5415040, 10830080, 21660160]

約数ペア:

[(1, 21660160), (2, 10830080), (4, 5415040), (5, 4332032), (8, 2707520), (10, 2166016), (16, 1353760), (20, 1083008), (32, 676880), (40, 541504), (64, 338440), (80, 270752), (128, 169220), (160, 135376), (256, 84610), (320, 67688), (512, 42305), (640, 33844), (1280, 16922), (2560, 8461)]