20388661472 has 24 divisors (see below), whose sum is σ = 40798216872. Its totient is φ = 10027209600.

The previous prime is 20388661471. The next prime is 20388661481. The reversal of 20388661472 is 27416688302.

It is a super-3 number, since 3×20388661472³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388661471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5220554 + ... + 5224457.

It is an arithmetic number, because the mean of its divisors is an integer number (1699925703).

Almost surely, 2^20388661472 is an apocalyptic number.

It is an amenable number.

20388661472 is an abundant number, since it is smaller than the sum of its proper divisors (20409555400).

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

20388661472 is a wasteful number, since it uses less digits than its factorization.

20388661472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10445082 (or 10445074 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 20388661472 in words is "twenty billion, three hundred eighty-eight million, six hundred sixty-one thousand, four hundred seventy-two".