20422431 has 6 divisors (see below), whose sum is σ = 29499080. Its totient is φ = 13614948.

The previous prime is 20422427. The next prime is 20422439. The reversal of 20422431 is 13422402.

It is not a de Polignac number, because 20422431 - 2² = 20422427 is a prime.

It is a super-2 number, since 2×20422431² = 834151375899522, 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 (20422439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134571 + ... + 1134588.

Almost surely, 2^20422431 is an apocalyptic number.

20422431 is a deficient number, since it is larger than the sum of its proper divisors (9076649).

20422431 is a wasteful number, since it uses less digits than its factorization.

20422431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269165 (or 2269162 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20422431 is about 4519.1183874734. The cubic root of 20422431 is about 273.3395525388.

Adding to 20422431 its reverse (13422402), we get a palindrome (33844833).

The spelling of 20422431 in words is "twenty million, four hundred twenty-two thousand, four hundred thirty-one".