20425166 has 16 divisors (see below), whose sum is σ = 31518720. Its totient is φ = 9922200.

The previous prime is 20425159. The next prime is 20425169. The reversal of 20425166 is 66152402.

It is a super-2 number, since 2×20425166² = 834374812255112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425169) 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, 13475 + ... + 14913.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^20425166 is an apocalyptic number.

20425166 is a deficient number, since it is larger than the sum of its proper divisors (11093554).

20425166 is a wasteful number, since it uses less digits than its factorization.

20425166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20425166 is about 4519.4209806125. The cubic root of 20425166 is about 273.3517539968.

Adding to 20425166 its reverse (66152402), we get a palindrome (86577568).

The spelling of 20425166 in words is "twenty million, four hundred twenty-five thousand, one hundred sixty-six".