20621764127 has 4 divisors (see below), whose sum is σ = 20959825896. Its totient is φ = 20283702360.

The previous prime is 20621764109. The next prime is 20621764147. The reversal of 20621764127 is 72146712602.

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

It is a cyclic number.

It is not a de Polignac number, because 20621764127 - 2⁶ = 20621764063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621764147) 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, 169030793 + ... + 169030914.

It is an arithmetic number, because the mean of its divisors is an integer number (5239956474).

Almost surely, 2^20621764127 is an apocalyptic number.

20621764127 is a deficient number, since it is larger than the sum of its proper divisors (338061769).

20621764127 is an equidigital number, since it uses as much as digits as its factorization.

20621764127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338061768.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 20621764127 in words is "twenty billion, six hundred twenty-one million, seven hundred sixty-four thousand, one hundred twenty-seven".