20263631 has 2 divisors, whose sum is σ = 20263632. Its totient is φ = 20263630.

The previous prime is 20263619. The next prime is 20263637. The reversal of 20263631 is 13636202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20263631 - 2⁶ = 20263567 is a prime.

It is a super-2 number, since 2×20263631² = 821229482608322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20263597 and 20263606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20263637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10131815 + 10131816.

It is an arithmetic number, because the mean of its divisors is an integer number (10131816).

Almost surely, 2^20263631 is an apocalyptic number.

20263631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20263631 is an equidigital number, since it uses as much as digits as its factorization.

20263631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20263631 is about 4501.5143007659. The cubic root of 20263631 is about 272.6292336537.

Adding to 20263631 its reverse (13636202), we get a palindrome (33899833).

The spelling of 20263631 in words is "twenty million, two hundred sixty-three thousand, six hundred thirty-one".