20209999964 has 24 divisors (see below), whose sum is σ = 44094546048. Its totient is φ = 7874025840.

The previous prime is 20209999963. The next prime is 20209999969. The reversal of 20209999964 is 46999990202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209999963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32808134 + ... + 32808749.

It is an arithmetic number, because the mean of its divisors is an integer number (1837272752).

Almost surely, 2^20209999964 is an apocalyptic number.

It is an amenable number.

20209999964 is an abundant number, since it is smaller than the sum of its proper divisors (23884546084).

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

20209999964 is a wasteful number, since it uses less digits than its factorization.

20209999964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65616905 (or 65616903 counting only the distinct ones).

The product of its (nonzero) digits is 5668704, while the sum is 59.

The spelling of 20209999964 in words is "twenty billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred sixty-four".