20522431 has 4 divisors (see below), whose sum is σ = 20539552. Its totient is φ = 20505312.

The previous prime is 20522429. The next prime is 20522449. The reversal of 20522431 is 13422502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13422502 = 2 ⋅6711251.

It is a cyclic number.

It is not a de Polignac number, because 20522431 - 2¹ = 20522429 is a prime.

It is a super-2 number, since 2×20522431² = 842340348299522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20522399 and 20522408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20522731) 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, 6615 + ... + 9208.

It is an arithmetic number, because the mean of its divisors is an integer number (5134888).

Almost surely, 2^20522431 is an apocalyptic number.

20522431 is a deficient number, since it is larger than the sum of its proper divisors (17121).

20522431 is a wasteful number, since it uses less digits than its factorization.

20522431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20522431 is about 4530.1689813957. The cubic root of 20522431 is about 273.7849690182.

Adding to 20522431 its reverse (13422502), we get a palindrome (33944933).

The spelling of 20522431 in words is "twenty million, five hundred twenty-two thousand, four hundred thirty-one".