20227661778 has 16 divisors (see below), whose sum is σ = 40517858880. Its totient is φ = 6732131376.

The previous prime is 20227661771. The next prime is 20227661819. The reversal of 20227661778 is 87716672202.

It is not an unprimeable number, because it can be changed into a prime (20227661771) 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, 2601433 + ... + 2609196.

It is an arithmetic number, because the mean of its divisors is an integer number (2532366180).

Almost surely, 2^20227661778 is an apocalyptic number.

20227661778 is an abundant number, since it is smaller than the sum of its proper divisors (20290197102).

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

20227661778 is a wasteful number, since it uses less digits than its factorization.

20227661778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211281.

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 20227661778 in words is "twenty billion, two hundred twenty-seven million, six hundred sixty-one thousand, seven hundred seventy-eight".