21418720

素因数分解:

$2^5\times 5^1\times {\mathrm{263}}^1\times {\mathrm{509}}^1$

素因数の和:787

約数の個数: 48

約数和(自身を含む): 50893920

約数和(自身を除く): 29475200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 263, 509, 526, 1018, 1052, 1315, 2036, 2104, 2545, 2630, 4072, 4208, 5090, 5260, 8144, 8416, 10180, 10520, 16288, 20360, 21040, 40720, 42080, 81440, 133867, 267734, 535468, 669335, 1070936, 1338670, 2141872, 2677340, 4283744, 5354680, 10709360, 21418720]

約数ペア:

[(1, 21418720), (2, 10709360), (4, 5354680), (5, 4283744), (8, 2677340), (10, 2141872), (16, 1338670), (20, 1070936), (32, 669335), (40, 535468), (80, 267734), (160, 133867), (263, 81440), (509, 42080), (526, 40720), (1018, 21040), (1052, 20360), (1315, 16288), (2036, 10520), (2104, 10180), (2545, 8416), (2630, 8144), (4072, 5260), (4208, 5090)]