20423401434 has 24 divisors (see below), whose sum is σ = 44262560160. Its totient is φ = 6805976328.

The previous prime is 20423401433. The next prime is 20423401447. The reversal of 20423401434 is 43410432402.

It is a happy number.

20423401434 is a `hidden beast` number, since 204 + 23 + 4 + 0 + 1 + 434 = 666.

It is a super-2 number, since 2×20423401434² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20423401398 and 20423401407.

It is not an unprimeable number, because it can be changed into a prime (20423401433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82102 + ... + 218145.

It is an arithmetic number, because the mean of its divisors is an integer number (1844273340).

Almost surely, 2^20423401434 is an apocalyptic number.

20423401434 is an abundant number, since it is smaller than the sum of its proper divisors (23839158726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423401434 is a wasteful number, since it uses less digits than its factorization.

20423401434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304034 (or 304031 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20423401434 its reverse (43410432402), we get a palindrome (63833833836).

The spelling of 20423401434 in words is "twenty billion, four hundred twenty-three million, four hundred one thousand, four hundred thirty-four".