20945471770 has 16 divisors (see below), whose sum is σ = 37704810528. Its totient is φ = 8377530640.

The previous prime is 20945471753. The next prime is 20945471777. The reversal of 20945471770 is 7717454902.

It is a self number, because there is not a number n which added to its sum of digits gives 20945471770.

It is not an unprimeable number, because it can be changed into a prime (20945471777) 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, 63765 + ... + 214375.

It is an arithmetic number, because the mean of its divisors is an integer number (2356550658).

Almost surely, 2^20945471770 is an apocalyptic number.

20945471770 is a deficient number, since it is larger than the sum of its proper divisors (16759338758).

20945471770 is a wasteful number, since it uses less digits than its factorization.

20945471770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164525.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 20945471770 in words is "twenty billion, nine hundred forty-five million, four hundred seventy-one thousand, seven hundred seventy".