81765760

素因数分解:

$2^7\times 5^1\times {\mathrm{251}}^1\times {\mathrm{509}}^1$

素因数の和:779

約数の個数: 64

約数和(自身を含む): 196635600

約数和(自身を除く): 114869840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 251, 320, 502, 509, 640, 1004, 1018, 1255, 2008, 2036, 2510, 2545, 4016, 4072, 5020, 5090, 8032, 8144, 10040, 10180, 16064, 16288, 20080, 20360, 32128, 32576, 40160, 40720, 65152, 80320, 81440, 127759, 160640, 162880, 255518, 325760, 511036, 638795, 1022072, 1277590, 2044144, 2555180, 4088288, 5110360, 8176576, 10220720, 16353152, 20441440, 40882880, 81765760]

約数ペア:

[(1, 81765760), (2, 40882880), (4, 20441440), (5, 16353152), (8, 10220720), (10, 8176576), (16, 5110360), (20, 4088288), (32, 2555180), (40, 2044144), (64, 1277590), (80, 1022072), (128, 638795), (160, 511036), (251, 325760), (320, 255518), (502, 162880), (509, 160640), (640, 127759), (1004, 81440), (1018, 80320), (1255, 65152), (2008, 40720), (2036, 40160), (2510, 32576), (2545, 32128), (4016, 20360), (4072, 20080), (5020, 16288), (5090, 16064), (8032, 10180), (8144, 10040)]