20252531 has 8 divisors (see below), whose sum is σ = 21908880. Its totient is φ = 18610272.

The previous prime is 20252521. The next prime is 20252539. The reversal of 20252531 is 13525202.

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

It is a cyclic number.

It is not a de Polignac number, because 20252531 - 2¹⁰ = 20251507 is a prime.

It is a super-2 number, since 2×20252531² = 820330023811922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20252539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (2738610).

Almost surely, 2^20252531 is an apocalyptic number.

20252531 is a deficient number, since it is larger than the sum of its proper divisors (1656349).

20252531 is a wasteful number, since it uses less digits than its factorization.

20252531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7045.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20252531 is about 4500.2812134354. The cubic root of 20252531 is about 272.5794443338.

Adding to 20252531 its reverse (13525202), we get a palindrome (33777733).

The spelling of 20252531 in words is "twenty million, two hundred fifty-two thousand, five hundred thirty-one".