20080021 has 8 divisors (see below), whose sum is σ = 21740544. Its totient is φ = 18436080.

The previous prime is 20080003. The next prime is 20080031. The reversal of 20080021 is 12008002.

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

It is not a de Polignac number, because 20080021 - 2⁷ = 20079893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20079983 and 20080010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20080031) 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, 1561 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (2717568).

Almost surely, 2^20080021 is an apocalyptic number.

It is an amenable number.

20080021 is a deficient number, since it is larger than the sum of its proper divisors (1660523).

20080021 is a wasteful number, since it uses less digits than its factorization.

20080021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8291.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20080021 is about 4481.0736436707. The cubic root of 20080021 is about 271.8032972668.

Adding to 20080021 its reverse (12008002), we get a palindrome (32088023).

The spelling of 20080021 in words is "twenty million, eighty thousand, twenty-one".