20591289620 has 24 divisors (see below), whose sum is σ = 47172773088. Its totient is φ = 7487741600.

The previous prime is 20591289581. The next prime is 20591289623. The reversal of 20591289620 is 2698219502.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20591289623) 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, 46798166 + ... + 46798605.

It is an arithmetic number, because the mean of its divisors is an integer number (1965532212).

Almost surely, 2^20591289620 is an apocalyptic number.

20591289620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20591289620 is an abundant number, since it is smaller than the sum of its proper divisors (26581483468).

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

20591289620 is a wasteful number, since it uses less digits than its factorization.

20591289620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93596791 (or 93596789 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 20591289620 in words is "twenty billion, five hundred ninety-one million, two hundred eighty-nine thousand, six hundred twenty".