20531416 has 8 divisors (see below), whose sum is σ = 38496420. Its totient is φ = 10265704.

The previous prime is 20531353. The next prime is 20531417. The reversal of 20531416 is 61413502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531417) 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 as a sum of consecutive naturals, namely, 1283206 + ... + 1283221.

Almost surely, 2^20531416 is an apocalyptic number.

It is an amenable number.

20531416 is a deficient number, since it is larger than the sum of its proper divisors (17965004).

20531416 is a wasteful number, since it uses less digits than its factorization.

20531416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566433 (or 2566429 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20531416 is about 4531.1605577379. The cubic root of 20531416 is about 273.8249187856.

Adding to 20531416 its reverse (61413502), we get a palindrome (81944918).

The spelling of 20531416 in words is "twenty million, five hundred thirty-one thousand, four hundred sixteen".