21030320

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1321}}^1$

素因数の和:1533

約数の個数: 40

約数和(自身を含む): 49178400

約数和(自身を除く): 28148080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1321, 1592, 1990, 2642, 3184, 3980, 5284, 6605, 7960, 10568, 13210, 15920, 21136, 26420, 52840, 105680, 262879, 525758, 1051516, 1314395, 2103032, 2628790, 4206064, 5257580, 10515160, 21030320]

約数ペア:

[(1, 21030320), (2, 10515160), (4, 5257580), (5, 4206064), (8, 2628790), (10, 2103032), (16, 1314395), (20, 1051516), (40, 525758), (80, 262879), (199, 105680), (398, 52840), (796, 26420), (995, 21136), (1321, 15920), (1592, 13210), (1990, 10568), (2642, 7960), (3184, 6605), (3980, 5284)]