31721380

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{251}}^1$

素因数の和:420

約数の個数: 48

約数和(自身を含む): 68584320

約数和(自身を除く): 36862940

約数列:

[1, 2, 4, 5, 10, 20, 71, 89, 142, 178, 251, 284, 355, 356, 445, 502, 710, 890, 1004, 1255, 1420, 1780, 2510, 5020, 6319, 12638, 17821, 22339, 25276, 31595, 35642, 44678, 63190, 71284, 89105, 89356, 111695, 126380, 178210, 223390, 356420, 446780, 1586069, 3172138, 6344276, 7930345, 15860690, 31721380]

約数ペア:

[(1, 31721380), (2, 15860690), (4, 7930345), (5, 6344276), (10, 3172138), (20, 1586069), (71, 446780), (89, 356420), (142, 223390), (178, 178210), (251, 126380), (284, 111695), (355, 89356), (356, 89105), (445, 71284), (502, 63190), (710, 44678), (890, 35642), (1004, 31595), (1255, 25276), (1420, 22339), (1780, 17821), (2510, 12638), (5020, 6319)]