20463531 has 16 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 11973920.

The previous prime is 20463523. The next prime is 20463533. The reversal of 20463531 is 13536402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20463531 - 2³ = 20463523 is a prime.

It is a super-2 number, since 2×20463531² = 837512201975922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20463533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9735 + ... + 11648.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^20463531 is an apocalyptic number.

20463531 is a deficient number, since it is larger than the sum of its proper divisors (10329429).

20463531 is a wasteful number, since it uses less digits than its factorization.

20463531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21426.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20463531 is about 4523.6634490201. The cubic root of 20463531 is about 273.5227943173.

Adding to 20463531 its reverse (13536402), we get a palindrome (33999933).

The spelling of 20463531 in words is "twenty million, four hundred sixty-three thousand, five hundred thirty-one".