20627830821 has 32 divisors (see below), whose sum is σ = 31875959808. Its totient is φ = 11751459840.

The previous prime is 20627830793. The next prime is 20627830903. The reversal of 20627830821 is 12803872602.

It is not a de Polignac number, because 20627830821 - 2⁵ = 20627830789 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 20627830821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20627837821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214581 + ... + 295466.

It is an arithmetic number, because the mean of its divisors is an integer number (996123744).

Almost surely, 2^20627830821 is an apocalyptic number.

It is an amenable number.

20627830821 is a deficient number, since it is larger than the sum of its proper divisors (11248128987).

20627830821 is a wasteful number, since it uses less digits than its factorization.

20627830821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510141.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 20627830821 in words is "twenty billion, six hundred twenty-seven million, eight hundred thirty thousand, eight hundred twenty-one".