20531551037 has 2 divisors, whose sum is σ = 20531551038. Its totient is φ = 20531551036.

The previous prime is 20531550961. The next prime is 20531551057. The reversal of 20531551037 is 73015513502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10638065881 + 9893485156 = 103141^2 + 99466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531551037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20531550994 and 20531551012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531551057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265775518 + 10265775519.

It is an arithmetic number, because the mean of its divisors is an integer number (10265775519).

Almost surely, 2^20531551037 is an apocalyptic number.

It is an amenable number.

20531551037 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531551037 is an equidigital number, since it uses as much as digits as its factorization.

20531551037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 32.

The spelling of 20531551037 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-one thousand, thirty-seven".