20945471718 has 32 divisors (see below), whose sum is σ = 43431183360. Its totient is φ = 6727085280.

The previous prime is 20945471717. The next prime is 20945471737. The reversal of 20945471718 is 81717454902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945471717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203280 + ... + 288467.

It is an arithmetic number, because the mean of its divisors is an integer number (1357224480).

Almost surely, 2^20945471718 is an apocalyptic number.

20945471718 is an abundant number, since it is smaller than the sum of its proper divisors (22485711642).

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

20945471718 is a wasteful number, since it uses less digits than its factorization.

20945471718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492012.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 20945471718 in words is "twenty billion, nine hundred forty-five million, four hundred seventy-one thousand, seven hundred eighteen".