20159677780 has 24 divisors (see below), whose sum is σ = 46183989600. Its totient is φ = 7330791840.

The previous prime is 20159677753. The next prime is 20159677789. The reversal of 20159677780 is 8777695102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20159677789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45817230 + ... + 45817669.

It is an arithmetic number, because the mean of its divisors is an integer number (1924332900).

Almost surely, 2^20159677780 is an apocalyptic number.

20159677780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20159677780 is an abundant number, since it is smaller than the sum of its proper divisors (26024311820).

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

20159677780 is a wasteful number, since it uses less digits than its factorization.

20159677780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91634919 (or 91634917 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 20159677780 in words is "twenty billion, one hundred fifty-nine million, six hundred seventy-seven thousand, seven hundred eighty".