20020749780 has 24 divisors (see below), whose sum is σ = 56058099552. Its totient is φ = 5338866592.

The previous prime is 20020749667. The next prime is 20020749803. The reversal of 20020749780 is 8794702002.

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, 166839522 + ... + 166839641.

It is an arithmetic number, because the mean of its divisors is an integer number (2335754148).

Almost surely, 2^20020749780 is an apocalyptic number.

20020749780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20020749780 is an abundant number, since it is smaller than the sum of its proper divisors (36037349772).

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

20020749780 is a wasteful number, since it uses less digits than its factorization.

20020749780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333679175 (or 333679173 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 20020749780 in words is "twenty billion, twenty million, seven hundred forty-nine thousand, seven hundred eighty".