20270531 has 4 divisors (see below), whose sum is σ = 20527200. Its totient is φ = 20013864.

The previous prime is 20270527. The next prime is 20270533. The reversal of 20270531 is 13507202.

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 20270531 - 2² = 20270527 is a prime.

It is a super-2 number, since 2×20270531² = 821788854043922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20270533) 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 3 ways as a sum of consecutive naturals, for example, 128216 + ... + 128373.

It is an arithmetic number, because the mean of its divisors is an integer number (5131800).

Almost surely, 2^20270531 is an apocalyptic number.

20270531 is a deficient number, since it is larger than the sum of its proper divisors (256669).

20270531 is an equidigital number, since it uses as much as digits as its factorization.

20270531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256668.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20270531 is about 4502.2806442957. The cubic root of 20270531 is about 272.6601746079.

Adding to 20270531 its reverse (13507202), we get a palindrome (33777733).

The spelling of 20270531 in words is "twenty million, two hundred seventy thousand, five hundred thirty-one".