20757785142 has 8 divisors (see below), whose sum is σ = 41515570296. Its totient is φ = 6919261712.

The previous prime is 20757785137. The next prime is 20757785143. The reversal of 20757785142 is 24158775702.

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

20757785142 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20757785091 and 20757785100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20757785143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1729815423 + ... + 1729815434.

It is an arithmetic number, because the mean of its divisors is an integer number (5189446287).

Almost surely, 2^20757785142 is an apocalyptic number.

20757785142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20757785142 is a wasteful number, since it uses less digits than its factorization.

20757785142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459630862.

The product of its (nonzero) digits is 1097600, while the sum is 48.

The spelling of 20757785142 in words is "twenty billion, seven hundred fifty-seven million, seven hundred eighty-five thousand, one hundred forty-two".