81315320

素因数分解:

$2^3\times 5^1\times {\mathrm{997}}^1\times {\mathrm{2039}}^1$

素因数の和:3047

約数の個数: 32

約数和(自身を含む): 183232800

約数和(自身を除く): 101917480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 997, 1994, 2039, 3988, 4078, 4985, 7976, 8156, 9970, 10195, 16312, 19940, 20390, 39880, 40780, 81560, 2032883, 4065766, 8131532, 10164415, 16263064, 20328830, 40657660, 81315320]

約数ペア:

[(1, 81315320), (2, 40657660), (4, 20328830), (5, 16263064), (8, 10164415), (10, 8131532), (20, 4065766), (40, 2032883), (997, 81560), (1994, 40780), (2039, 39880), (3988, 20390), (4078, 19940), (4985, 16312), (7976, 10195), (8156, 9970)]