20540500421 has 16 divisors (see below), whose sum is σ = 23686992000. Its totient is φ = 17447719488.

The previous prime is 20540500361. The next prime is 20540500429. The reversal of 20540500421 is 12400504502.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20540500421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540500429) 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, 339155 + ... + 395103.

It is an arithmetic number, because the mean of its divisors is an integer number (1480437000).

Almost surely, 2^20540500421 is an apocalyptic number.

It is an amenable number.

20540500421 is a deficient number, since it is larger than the sum of its proper divisors (3146491579).

20540500421 is a wasteful number, since it uses less digits than its factorization.

20540500421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56428.

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 20540500421 in words is "twenty billion, five hundred forty million, five hundred thousand, four hundred twenty-one".