20642117426 has 32 divisors (see below), whose sum is σ = 35634079872. Its totient is φ = 8784927360.

The previous prime is 20642117407. The next prime is 20642117453. The reversal of 20642117426 is 62471124602.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1253486 + ... + 1269846.

It is an arithmetic number, because the mean of its divisors is an integer number (1113564996).

Almost surely, 2^20642117426 is an apocalyptic number.

20642117426 is a deficient number, since it is larger than the sum of its proper divisors (14991962446).

20642117426 is a wasteful number, since it uses less digits than its factorization.

20642117426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16994.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 20642117426 in words is "twenty billion, six hundred forty-two million, one hundred seventeen thousand, four hundred twenty-six".