20778339278 has 8 divisors (see below), whose sum is σ = 31695771960. Its totient is φ = 10213081960.

The previous prime is 20778339229. The next prime is 20778339313. The reversal of 20778339278 is 87293387702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20778339278² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 88043693 + ... + 88043928.

It is an arithmetic number, because the mean of its divisors is an integer number (3961971495).

Almost surely, 2^20778339278 is an apocalyptic number.

20778339278 is a deficient number, since it is larger than the sum of its proper divisors (10917432682).

20778339278 is a wasteful number, since it uses less digits than its factorization.

20778339278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176087682.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 20778339278 in words is "twenty billion, seven hundred seventy-eight million, three hundred thirty-nine thousand, two hundred seventy-eight".