23205578890 has 32 divisors (see below), whose sum is σ = 44991913680. Its totient is φ = 8566539264.

The previous prime is 23205578863. The next prime is 23205578909. The reversal of 23205578890 is 9887550232.

It can be written as a sum of positive squares in 8 ways, for example, as 2895623721 + 20309955169 = 53811^2 + 142513^2 .

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, 795442 + ... + 824098.

Almost surely, 2^23205578890 is an apocalyptic number.

23205578890 is a deficient number, since it is larger than the sum of its proper divisors (21786334790).

23205578890 is a wasteful number, since it uses less digits than its factorization.

23205578890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34906.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 23205578890 in words is "twenty-three billion, two hundred five million, five hundred seventy-eight thousand, eight hundred ninety".