20621416054 has 4 divisors (see below), whose sum is σ = 30932124084. Its totient is φ = 10310708026.

The previous prime is 20621416033. The next prime is 20621416063. The reversal of 20621416054 is 45061412602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155354012 + ... + 5155354015.

It is an arithmetic number, because the mean of its divisors is an integer number (7733031021).

Almost surely, 2^20621416054 is an apocalyptic number.

20621416054 is a deficient number, since it is larger than the sum of its proper divisors (10310708030).

20621416054 is a wasteful number, since it uses less digits than its factorization.

20621416054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310708029.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 20621416054 its reverse (45061412602), we get a palindrome (65682828656).

The spelling of 20621416054 in words is "twenty billion, six hundred twenty-one million, four hundred sixteen thousand, fifty-four".