20687360

素因数分解:

$2^9\times 5^1\times {\mathrm{8081}}^1$

素因数の和:8104

約数の個数: 40

約数和(自身を含む): 49607316

約数和(自身を除く): 28919956

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8081, 16162, 32324, 40405, 64648, 80810, 129296, 161620, 258592, 323240, 517184, 646480, 1034368, 1292960, 2068736, 2585920, 4137472, 5171840, 10343680, 20687360]

約数ペア:

[(1, 20687360), (2, 10343680), (4, 5171840), (5, 4137472), (8, 2585920), (10, 2068736), (16, 1292960), (20, 1034368), (32, 646480), (40, 517184), (64, 323240), (80, 258592), (128, 161620), (160, 129296), (256, 80810), (320, 64648), (512, 40405), (640, 32324), (1280, 16162), (2560, 8081)]