20903638488 has 32 divisors (see below), whose sum is σ = 52383844800. Its totient is φ = 6951246368.

The previous prime is 20903638487. The next prime is 20903638493. The reversal of 20903638488 is 88483630902.

It is a super-2 number, since 2×20903638488² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20903638488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903638487) 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, 1029306 + ... + 1049417.

It is an arithmetic number, because the mean of its divisors is an integer number (1636995150).

Almost surely, 2^20903638488 is an apocalyptic number.

It is an amenable number.

20903638488 is an abundant number, since it is smaller than the sum of its proper divisors (31480206312).

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

20903638488 is a wasteful number, since it uses less digits than its factorization.

20903638488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079151 (or 2079147 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 20903638488 in words is "twenty billion, nine hundred three million, six hundred thirty-eight thousand, four hundred eighty-eight".