20920393821 has 8 divisors (see below), whose sum is σ = 29361956320. Its totient is φ = 13212880272.

The previous prime is 20920393807. The next prime is 20920393829. The reversal of 20920393821 is 12839302902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20920393821 - 2⁵ = 20920393789 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 20920393821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920393829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183512170 + ... + 183512283.

It is an arithmetic number, because the mean of its divisors is an integer number (3670244540).

Almost surely, 2^20920393821 is an apocalyptic number.

It is an amenable number.

20920393821 is a deficient number, since it is larger than the sum of its proper divisors (8441562499).

20920393821 is a wasteful number, since it uses less digits than its factorization.

20920393821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367024475.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 20920393821 in words is "twenty billion, nine hundred twenty million, three hundred ninety-three thousand, eight hundred twenty-one".