20218787264 has 112 divisors (see below), whose sum is σ = 45170872320. Its totient is φ = 8915512320.

The previous prime is 20218787219. The next prime is 20218787299. The reversal of 20218787264 is 46278781202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2032607 + ... + 2042529.

It is an arithmetic number, because the mean of its divisors is an integer number (403311360).

Almost surely, 2^20218787264 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 20218787264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22585436160).

20218787264 is an abundant number, since it is smaller than the sum of its proper divisors (24952085056).

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

20218787264 is a wasteful number, since it uses less digits than its factorization.

20218787264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058 (or 10048 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 47.

The spelling of 20218787264 in words is "twenty billion, two hundred eighteen million, seven hundred eighty-seven thousand, two hundred sixty-four".