20402227968 has 144 divisors (see below), whose sum is σ = 57264049920. Its totient is φ = 6430814208.

The previous prime is 20402227961. The next prime is 20402227991. The reversal of 20402227968 is 86972220402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20402227961) 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, 11045221 + ... + 11047067.

Almost surely, 2^20402227968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402227968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28632024960).

20402227968 is an abundant number, since it is smaller than the sum of its proper divisors (36861821952).

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

20402227968 is a wasteful number, since it uses less digits than its factorization.

20402227968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642 (or 2628 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 20402227968 in words is "twenty billion, four hundred two million, two hundred twenty-seven thousand, nine hundred sixty-eight".