20549631 has 4 divisors (see below), whose sum is σ = 27399512. Its totient is φ = 13699752.

The previous prime is 20549611. The next prime is 20549647. The reversal of 20549631 is 13694502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20549631 - 2⁶ = 20549567 is a prime.

It is a super-2 number, since 2×20549631² = 844574668472322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3424936 + ... + 3424941.

It is an arithmetic number, because the mean of its divisors is an integer number (6849878).

Almost surely, 2^20549631 is an apocalyptic number.

20549631 is a deficient number, since it is larger than the sum of its proper divisors (6849881).

20549631 is an equidigital number, since it uses as much as digits as its factorization.

20549631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6849880.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20549631 is about 4533.1700828449. The cubic root of 20549631 is about 273.9058719068.

The spelling of 20549631 in words is "twenty million, five hundred forty-nine thousand, six hundred thirty-one".