20522457 has 16 divisors (see below), whose sum is σ = 31226880. Its totient is φ = 13311216.

The previous prime is 20522449. The next prime is 20522477. The reversal of 20522457 is 75422502.

20522457 is a `hidden beast` number, since 205 + 2 + 2 + 457 = 666.

It is not a de Polignac number, because 20522457 - 2³ = 20522449 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 20522457.

It is not an unprimeable number, because it can be changed into a prime (20522477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9273 + ... + 11270.

It is an arithmetic number, because the mean of its divisors is an integer number (1951680).

Almost surely, 2^20522457 is an apocalyptic number.

20522457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20522457 is a deficient number, since it is larger than the sum of its proper divisors (10704423).

20522457 is a wasteful number, since it uses less digits than its factorization.

20522457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20589 (or 20583 counting only the distinct ones).

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

The square root of 20522457 is about 4530.1718510449. The cubic root of 20522457 is about 273.7850846382.

Adding to 20522457 its reverse (75422502), we get a palindrome (95944959).

The spelling of 20522457 in words is "twenty million, five hundred twenty-two thousand, four hundred fifty-seven".