20201720202 has 24 divisors (see below), whose sum is σ = 43799652000. Its totient is φ = 6729405480.

The previous prime is 20201720179. The next prime is 20201720213. The reversal of 20201720202 is 20202710202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347374 + ... + 401337.

It is an arithmetic number, because the mean of its divisors is an integer number (1824985500).

Almost surely, 2^20201720202 is an apocalyptic number.

20201720202 is an abundant number, since it is smaller than the sum of its proper divisors (23597931798).

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

20201720202 is a wasteful number, since it uses less digits than its factorization.

20201720202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750218 (or 750215 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The spelling of 20201720202 in words is "twenty billion, two hundred one million, seven hundred twenty thousand, two hundred two".