20266537 has 2 divisors, whose sum is σ = 20266538. Its totient is φ = 20266536.

The previous prime is 20266531. The next prime is 20266553. The reversal of 20266537 is 73566202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13169641 + 7096896 = 3629^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266537 - 2⁷ = 20266409 is a prime.

It is a Chen prime.

It is equal to p_1286446 and since 20266537 and 1286446 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20266499 and 20266508.

It is not a weakly prime, because it can be changed into another prime (20266531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133268 + 10133269.

It is an arithmetic number, because the mean of its divisors is an integer number (10133269).

Almost surely, 2^20266537 is an apocalyptic number.

It is an amenable number.

20266537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266537 is an equidigital number, since it uses as much as digits as its factorization.

20266537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 20266537 is about 4501.8370694640. The cubic root of 20266537 is about 272.6422655841.

The spelling of 20266537 in words is "twenty million, two hundred sixty-six thousand, five hundred thirty-seven".