20536431 has 8 divisors (see below), whose sum is σ = 27653424. Its totient is φ = 13555200.

The previous prime is 20536429. The next prime is 20536457. The reversal of 20536431 is 13463502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20536431 - 2¹ = 20536429 is a prime.

It is a super-2 number, since 2×20536431² = 843489996435522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33586 + ... + 34191.

It is an arithmetic number, because the mean of its divisors is an integer number (3456678).

Almost surely, 2^20536431 is an apocalyptic number.

20536431 is a deficient number, since it is larger than the sum of its proper divisors (7116993).

20536431 is a wasteful number, since it uses less digits than its factorization.

20536431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67881.

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

The square root of 20536431 is about 4531.7139141830. The cubic root of 20536431 is about 273.8472117792.

Adding to 20536431 its reverse (13463502), we get a palindrome (33999933).

The spelling of 20536431 in words is "twenty million, five hundred thirty-six thousand, four hundred thirty-one".