81139840

素因数分解:

$2^7\times 5^1\times {\mathrm{126781}}^1$

素因数の和:126800

約数の個数: 32

約数和(自身を含む): 193976460

約数和(自身を除く): 112836620

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 126781, 253562, 507124, 633905, 1014248, 1267810, 2028496, 2535620, 4056992, 5071240, 8113984, 10142480, 16227968, 20284960, 40569920, 81139840]

約数ペア:

[(1, 81139840), (2, 40569920), (4, 20284960), (5, 16227968), (8, 10142480), (10, 8113984), (16, 5071240), (20, 4056992), (32, 2535620), (40, 2028496), (64, 1267810), (80, 1014248), (128, 633905), (160, 507124), (320, 253562), (640, 126781)]