About the Number

21000988

21000987 ← → 21000989

2進数表記:1010000000111001100011100

漢数字表記:二千百万九百八十八

素因数分解:

2 2 × 29 1 × 197 1 × 919 1

素因数の和:1149
約数の個数: 24
約数和(自身を含む): 38253600
約数和(自身を除く): 17252612

約数列:
[1, 2, 4, 29, 58, 116, 197, 394, 788, 919, 1838, 3676, 5713, 11426, 22852, 26651, 53302, 106604, 181043, 362086, 724172, 5250247, 10500494, 21000988]

約数ペア:
[(1, 21000988), (2, 10500494), (4, 5250247), (29, 724172), (58, 362086), (116, 181043), (197, 106604), (394, 53302), (788, 26651), (919, 22852), (1838, 11426), (3676, 5713)]

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