20573978907 has 6 divisors (see below), whose sum is σ = 27432303132. Its totient is φ = 13715820312.

The previous prime is 20573978891. The next prime is 20573978947. The reversal of 20573978907 is 70987937502.

It is not a de Polignac number, because 20573978907 - 2⁴ = 20573978891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20573978947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207033 + ... + 289845.

It is an arithmetic number, because the mean of its divisors is an integer number (4572050522).

Almost surely, 2^20573978907 is an apocalyptic number.

20573978907 is a deficient number, since it is larger than the sum of its proper divisors (6858324225).

20573978907 is an frugal number, since it uses more digits than its factorization.

20573978907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165629 (or 82816 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 57.

The spelling of 20573978907 in words is "twenty billion, five hundred seventy-three million, nine hundred seventy-eight thousand, nine hundred seven".