20689021080 has 1536 divisors, whose sum is σ = 96181344000. Its totient is φ = 3901685760.

The previous prime is 20689021057. The next prime is 20689021081. The reversal of 20689021080 is 8012098602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689021081) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 339164250 + ... + 339164310.

Almost surely, 2^20689021080 is an apocalyptic number.

20689021080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20689021080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48090672000).

20689021080 is an abundant number, since it is smaller than the sum of its proper divisors (75492322920).

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

20689021080 is a wasteful number, since it uses less digits than its factorization.

20689021080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 20689021080 in words is "twenty billion, six hundred eighty-nine million, twenty-one thousand, eighty".