20423423433 has 32 divisors (see below), whose sum is σ = 32964938496. Its totient is φ = 10979739648.

The previous prime is 20423423401. The next prime is 20423423477. The reversal of 20423423433 is 33432432402.

It is not a de Polignac number, because 20423423433 - 2⁵ = 20423423401 is a prime.

It is a super-2 number, since 2×20423423433² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20423423433.

It is not an unprimeable number, because it can be changed into a prime (20423423533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1044535 + ... + 1063907.

It is an arithmetic number, because the mean of its divisors is an integer number (1030154328).

Almost surely, 2^20423423433 is an apocalyptic number.

It is an amenable number.

20423423433 is a deficient number, since it is larger than the sum of its proper divisors (12541515063).

20423423433 is a wasteful number, since it uses less digits than its factorization.

20423423433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22353.

The product of its (nonzero) digits is 41472, while the sum is 30.

Adding to 20423423433 its reverse (33432432402), we get a palindrome (53855855835).

The spelling of 20423423433 in words is "twenty billion, four hundred twenty-three million, four hundred twenty-three thousand, four hundred thirty-three".