20003121976 has 16 divisors (see below), whose sum is σ = 37512645840. Its totient is φ = 9999749760.

The previous prime is 20003121973. The next prime is 20003121977. The reversal of 20003121976 is 67912130002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20003121973) 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, 178881 + ... + 268336.

It is an arithmetic number, because the mean of its divisors is an integer number (2344540365).

Almost surely, 2^20003121976 is an apocalyptic number.

It is an amenable number.

20003121976 is a deficient number, since it is larger than the sum of its proper divisors (17509523864).

20003121976 is a wasteful number, since it uses less digits than its factorization.

20003121976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452814 (or 452810 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

Adding to 20003121976 its reverse (67912130002), we get a palindrome (87915251978).

The spelling of 20003121976 in words is "twenty billion, three million, one hundred twenty-one thousand, nine hundred seventy-six".