20242631 has 4 divisors (see below), whose sum is σ = 21433392. Its totient is φ = 19051872.

The previous prime is 20242603. The next prime is 20242687. The reversal of 20242631 is 13624202.

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

It is a cyclic number.

It is not a de Polignac number, because 20242631 - 2⁶ = 20242567 is a prime.

It is a super-2 number, since 2×20242631² = 819528219604322, 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 (20242031) 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, 595355 + ... + 595388.

It is an arithmetic number, because the mean of its divisors is an integer number (5358348).

Almost surely, 2^20242631 is an apocalyptic number.

20242631 is a deficient number, since it is larger than the sum of its proper divisors (1190761).

20242631 is a wasteful number, since it uses less digits than its factorization.

20242631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190760.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20242631 is about 4499.1811477201. The cubic root of 20242631 is about 272.5350222921.

Adding to 20242631 its reverse (13624202), we get a palindrome (33866833).

The spelling of 20242631 in words is "twenty million, two hundred forty-two thousand, six hundred thirty-one".