20252457 has 16 divisors (see below), whose sum is σ = 31769280. Its totient is φ = 12707136.

The previous prime is 20252447. The next prime is 20252459. The reversal of 20252457 is 75425202.

20252457 is a `hidden beast` number, since 202 + 5 + 2 + 457 = 666.

It is not a de Polignac number, because 20252457 - 2²⁰ = 19203881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20252457.

It is not an unprimeable number, because it can be changed into a prime (20252459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21603 + ... + 22520.

It is an arithmetic number, because the mean of its divisors is an integer number (1985580).

Almost surely, 2^20252457 is an apocalyptic number.

20252457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20252457 is a deficient number, since it is larger than the sum of its proper divisors (11516823).

20252457 is a wasteful number, since it uses less digits than its factorization.

20252457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44149 (or 44143 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20252457 is about 4500.2729917195. The cubic root of 20252457 is about 272.5791123439.

Adding to 20252457 its reverse (75425202), we get a palindrome (95677659).

The spelling of 20252457 in words is "twenty million, two hundred fifty-two thousand, four hundred fifty-seven".