20425164 has 24 divisors (see below), whose sum is σ = 49302960. Its totient is φ = 6573504.

The previous prime is 20425159. The next prime is 20425169. The reversal of 20425164 is 46152402.

It is an interprime number because it is at equal distance from previous prime (20425159) and next prime (20425169).

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, 28999 + ... + 29694.

It is an arithmetic number, because the mean of its divisors is an integer number (2054290).

Almost surely, 2^20425164 is an apocalyptic number.

It is an amenable number.

20425164 is an abundant number, since it is smaller than the sum of its proper divisors (28877796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20425164 is a wasteful number, since it uses less digits than its factorization.

20425164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58729 (or 58727 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20425164 is about 4519.4207593452. The cubic root of 20425164 is about 273.3517450748.

Adding to 20425164 its reverse (46152402), we get a palindrome (66577566).

The spelling of 20425164 in words is "twenty million, four hundred twenty-five thousand, one hundred sixty-four".