20733631 has 2 divisors, whose sum is σ = 20733632. Its totient is φ = 20733630.

The previous prime is 20733613. The next prime is 20733641. The reversal of 20733631 is 13633702.

Together with previous prime (20733613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20733631 is a prime.

It is a super-2 number, since 2×20733631² = 859766908888322, which contains 22 as substring.

It is equal to p_1314187 and since 20733631 and 1314187 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 = 20733596 and 20733605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20733641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366815 + 10366816.

It is an arithmetic number, because the mean of its divisors is an integer number (10366816).

Almost surely, 2^20733631 is an apocalyptic number.

20733631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20733631 is an equidigital number, since it uses as much as digits as its factorization.

20733631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 25.

The square root of 20733631 is about 4553.4197039148. The cubic root of 20733631 is about 274.7209555148.

The spelling of 20733631 in words is "twenty million, seven hundred thirty-three thousand, six hundred thirty-one".