81216040

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{3989}}^1$

素因数の和:4509

約数の個数: 32

約数和(自身を含む): 183141000

約数和(自身を除く): 101924960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 2036, 2545, 3989, 4072, 5090, 7978, 10180, 15956, 19945, 20360, 31912, 39890, 79780, 159560, 2030401, 4060802, 8121604, 10152005, 16243208, 20304010, 40608020, 81216040]

約数ペア:

[(1, 81216040), (2, 40608020), (4, 20304010), (5, 16243208), (8, 10152005), (10, 8121604), (20, 4060802), (40, 2030401), (509, 159560), (1018, 79780), (2036, 39890), (2545, 31912), (3989, 20360), (4072, 19945), (5090, 15956), (7978, 10180)]