20492424921 has 16 divisors (see below), whose sum is σ = 27434665280. Its totient is φ = 13606004160.

The previous prime is 20492424919. The next prime is 20492424929. The reversal of 20492424921 is 12942429402.

It is not a de Polignac number, because 20492424921 - 2¹ = 20492424919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20492424921.

It is not an unprimeable number, because it can be changed into a prime (20492424929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814551 + ... + 839331.

It is an arithmetic number, because the mean of its divisors is an integer number (1714666580).

Almost surely, 2^20492424921 is an apocalyptic number.

It is an amenable number.

20492424921 is a deficient number, since it is larger than the sum of its proper divisors (6942240359).

20492424921 is a wasteful number, since it uses less digits than its factorization.

20492424921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25896.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 20492424921 in words is "twenty billion, four hundred ninety-two million, four hundred twenty-four thousand, nine hundred twenty-one".