20649975192 has 512 divisors, whose sum is σ = 74656972800. Its totient is φ = 5174928000.

The previous prime is 20649975179. The next prime is 20649975193. The reversal of 20649975192 is 29157994602.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649975193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 62386467 + ... + 62386797.

It is an arithmetic number, because the mean of its divisors is an integer number (145814400).

Almost surely, 2^20649975192 is an apocalyptic number.

20649975192 is a gapful number since it is divisible by the number (22) 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 20649975192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37328486400).

20649975192 is an abundant number, since it is smaller than the sum of its proper divisors (54006997608).

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

20649975192 is a wasteful number, since it uses less digits than its factorization.

20649975192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 20649975192 in words is "twenty billion, six hundred forty-nine million, nine hundred seventy-five thousand, one hundred ninety-two".