20998900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{557}}^1$

素因数の和:613

約数の個数: 72

約数和(自身を含む): 50856120

約数和(自身を除く): 29857220

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 29, 50, 52, 58, 65, 100, 116, 130, 145, 260, 290, 325, 377, 557, 580, 650, 725, 754, 1114, 1300, 1450, 1508, 1885, 2228, 2785, 2900, 3770, 5570, 7241, 7540, 9425, 11140, 13925, 14482, 16153, 18850, 27850, 28964, 32306, 36205, 37700, 55700, 64612, 72410, 80765, 144820, 161530, 181025, 209989, 323060, 362050, 403825, 419978, 724100, 807650, 839956, 1049945, 1615300, 2099890, 4199780, 5249725, 10499450, 20998900]

約数ペア:

[(1, 20998900), (2, 10499450), (4, 5249725), (5, 4199780), (10, 2099890), (13, 1615300), (20, 1049945), (25, 839956), (26, 807650), (29, 724100), (50, 419978), (52, 403825), (58, 362050), (65, 323060), (100, 209989), (116, 181025), (130, 161530), (145, 144820), (260, 80765), (290, 72410), (325, 64612), (377, 55700), (557, 37700), (580, 36205), (650, 32306), (725, 28964), (754, 27850), (1114, 18850), (1300, 16153), (1450, 14482), (1508, 13925), (1885, 11140), (2228, 9425), (2785, 7540), (2900, 7241), (3770, 5570)]