20778742325 has 12 divisors (see below), whose sum is σ = 28107971808. Its totient is φ = 15111812400.

The previous prime is 20778742297. The next prime is 20778742333. The reversal of 20778742325 is 52324787702.

It is not a de Polignac number, because 20778742325 - 2²⁰ = 20777693749 is a prime.

It is a super-2 number, since 2×20778742325² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20778742325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37779257 + ... + 37779806.

It is an arithmetic number, because the mean of its divisors is an integer number (2342330984).

Almost surely, 2^20778742325 is an apocalyptic number.

20778742325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20778742325 is a deficient number, since it is larger than the sum of its proper divisors (7329229483).

20778742325 is a wasteful number, since it uses less digits than its factorization.

20778742325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75559084 (or 75559079 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 47.

The spelling of 20778742325 in words is "twenty billion, seven hundred seventy-eight million, seven hundred forty-two thousand, three hundred twenty-five".