20352778686 has 32 divisors (see below), whose sum is σ = 45427668480. Its totient is φ = 6754368888.

The previous prime is 20352778673. The next prime is 20352778687. The reversal of 20352778686 is 68687725302.

20352778686 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20352778687) 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, 817926 + ... + 842441.

It is an arithmetic number, because the mean of its divisors is an integer number (1419614640).

Almost surely, 2^20352778686 is an apocalyptic number.

20352778686 is an abundant number, since it is smaller than the sum of its proper divisors (25074889794).

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

20352778686 is a wasteful number, since it uses less digits than its factorization.

20352778686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660605 (or 1660599 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 20352778686 in words is "twenty billion, three hundred fifty-two million, seven hundred seventy-eight thousand, six hundred eighty-six".