81471880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{290971}}^1$

素因数の和:290989

約数の個数: 32

約数和(自身を含む): 209499840

約数和(自身を除く): 128027960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 290971, 581942, 1163884, 1454855, 2036797, 2327768, 2909710, 4073594, 5819420, 8147188, 10183985, 11638840, 16294376, 20367970, 40735940, 81471880]

約数ペア:

[(1, 81471880), (2, 40735940), (4, 20367970), (5, 16294376), (7, 11638840), (8, 10183985), (10, 8147188), (14, 5819420), (20, 4073594), (28, 2909710), (35, 2327768), (40, 2036797), (56, 1454855), (70, 1163884), (140, 581942), (280, 290971)]