21680720

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{11783}}^1$

素因数の和:11819

約数の個数: 40

約数和(自身を含む): 52603776

約数和(自身を除く): 30923056

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 80, 92, 115, 184, 230, 368, 460, 920, 1840, 11783, 23566, 47132, 58915, 94264, 117830, 188528, 235660, 271009, 471320, 542018, 942640, 1084036, 1355045, 2168072, 2710090, 4336144, 5420180, 10840360, 21680720]

約数ペア:

[(1, 21680720), (2, 10840360), (4, 5420180), (5, 4336144), (8, 2710090), (10, 2168072), (16, 1355045), (20, 1084036), (23, 942640), (40, 542018), (46, 471320), (80, 271009), (92, 235660), (115, 188528), (184, 117830), (230, 94264), (368, 58915), (460, 47132), (920, 23566), (1840, 11783)]