20020431 has 4 divisors (see below), whose sum is σ = 26693912. Its totient is φ = 13346952.

The previous prime is 20020421. The next prime is 20020439. The reversal of 20020431 is 13402002.

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

It is not a de Polignac number, because 20020431 - 2⁷ = 20020303 is a prime.

It is a super-2 number, since 2×20020431² = 801635314851522, 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 (20020439) 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, 3336736 + ... + 3336741.

It is an arithmetic number, because the mean of its divisors is an integer number (6673478).

Almost surely, 2^20020431 is an apocalyptic number.

20020431 is a deficient number, since it is larger than the sum of its proper divisors (6673481).

20020431 is an equidigital number, since it uses as much as digits as its factorization.

20020431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673480.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20020431 is about 4474.4196271695. The cubic root of 20020431 is about 271.5341606471.

Adding to 20020431 its reverse (13402002), we get a palindrome (33422433).

The spelling of 20020431 in words is "twenty million, twenty thousand, four hundred thirty-one".