20770978398 has 16 divisors (see below), whose sum is σ = 41759456256. Its totient is φ = 6887409560.

The previous prime is 20770978343. The next prime is 20770978427. The reversal of 20770978398 is 89387907702.

It is a super-2 number, since 2×20770978398² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9061236 + ... + 9063527.

It is an arithmetic number, because the mean of its divisors is an integer number (2609966016).

Almost surely, 2^20770978398 is an apocalyptic number.

20770978398 is an abundant number, since it is smaller than the sum of its proper divisors (20988477858).

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

20770978398 is a wasteful number, since it uses less digits than its factorization.

20770978398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18124959.

The product of its (nonzero) digits is 10668672, while the sum is 60.

The spelling of 20770978398 in words is "twenty billion, seven hundred seventy million, nine hundred seventy-eight thousand, three hundred ninety-eight".