81121720

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{22787}}^1$

素因数の和:22887

約数の個数: 32

約数和(自身を含む): 184582800

約数和(自身を除く): 103461080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 22787, 45574, 91148, 113935, 182296, 227870, 455740, 911480, 2028043, 4056086, 8112172, 10140215, 16224344, 20280430, 40560860, 81121720]

約数ペア:

[(1, 81121720), (2, 40560860), (4, 20280430), (5, 16224344), (8, 10140215), (10, 8112172), (20, 4056086), (40, 2028043), (89, 911480), (178, 455740), (356, 227870), (445, 182296), (712, 113935), (890, 91148), (1780, 45574), (3560, 22787)]