20778233488 has 20 divisors (see below), whose sum is σ = 42008168448. Its totient is φ = 9937415840.

The previous prime is 20778233479. The next prime is 20778233537. The reversal of 20778233488 is 88433287702.

It is a super-2 number, since 2×20778233488² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28230928 + ... + 28231663.

Almost surely, 2^20778233488 is an apocalyptic number.

It is an amenable number.

20778233488 is an abundant number, since it is smaller than the sum of its proper divisors (21229934960).

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

20778233488 is a wasteful number, since it uses less digits than its factorization.

20778233488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56462622 (or 56462616 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 20778233488 in words is "twenty billion, seven hundred seventy-eight million, two hundred thirty-three thousand, four hundred eighty-eight".