20677845888 has 224 divisors, whose sum is σ = 70588475760. Its totient is φ = 5907769344.

The previous prime is 20677845869. The next prime is 20677845889. The reversal of 20677845888 is 88854877602.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20677845889) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 637356 + ... + 669012.

Almost surely, 2^20677845888 is an apocalyptic number.

20677845888 is a gapful number since it is divisible by the number (28) 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 20677845888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35294237880).

20677845888 is an abundant number, since it is smaller than the sum of its proper divisors (49910629872).

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

20677845888 is an frugal number, since it uses more digits than its factorization.

20677845888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31696 (or 31669 counting only the distinct ones).

The product of its (nonzero) digits is 48168960, while the sum is 63.

The spelling of 20677845888 in words is "twenty billion, six hundred seventy-seven million, eight hundred forty-five thousand, eight hundred eighty-eight".