20204731288 has 64 divisors (see below), whose sum is σ = 44814312000. Its totient is φ = 8355820032.

The previous prime is 20204731273. The next prime is 20204731331. The reversal of 20204731288 is 88213740202.

It is a super-2 number, since 2×20204731288² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5241970 + ... + 5245822.

It is an arithmetic number, because the mean of its divisors is an integer number (700223625).

Almost surely, 2^20204731288 is an apocalyptic number.

20204731288 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 20204731288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22407156000).

20204731288 is an abundant number, since it is smaller than the sum of its proper divisors (24609580712).

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

20204731288 is a wasteful number, since it uses less digits than its factorization.

20204731288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124 (or 7120 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 20204731288 in words is "twenty billion, two hundred four million, seven hundred thirty-one thousand, two hundred eighty-eight".