About the Number

20402081

20402080 ← → 20402082

2進数表記:1001101110100111110100001

漢数字表記:二千四十万二千八十一

素因数分解:

7 2 × 23 1 × 43 1 × 421 1

素因数の和:501
約数の個数: 24
約数和(自身を含む): 25401024
約数和(自身を除く): 4998943

約数列:
[1, 7, 23, 43, 49, 161, 301, 421, 989, 1127, 2107, 2947, 6923, 9683, 18103, 20629, 48461, 67781, 126721, 416369, 474467, 887047, 2914583, 20402081]

約数ペア:
[(1, 20402081), (7, 2914583), (23, 887047), (43, 474467), (49, 416369), (161, 126721), (301, 67781), (421, 48461), (989, 20629), (1127, 18103), (2107, 9683), (2947, 6923)]

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