20025221 has 4 divisors (see below), whose sum is σ = 21079200. Its totient is φ = 18971244.

The previous prime is 20025211. The next prime is 20025227. The reversal of 20025221 is 12252002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20025221 - 2²² = 15830917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20025196 and 20025205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20025227) 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, 526961 + ... + 526998.

It is an arithmetic number, because the mean of its divisors is an integer number (5269800).

Almost surely, 2^20025221 is an apocalyptic number.

It is an amenable number.

20025221 is a deficient number, since it is larger than the sum of its proper divisors (1053979).

20025221 is a wasteful number, since it uses less digits than its factorization.

20025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053978.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20025221 is about 4474.9548601075. The cubic root of 20025221 is about 271.5558142754. Note that the first 3 decimals are identical.

Adding to 20025221 its reverse (12252002), we get a palindrome (32277223).

The spelling of 20025221 in words is "twenty million, twenty-five thousand, two hundred twenty-one".