20506437 has 48 divisors (see below), whose sum is σ = 36796032. Its totient is φ = 10736640.

The previous prime is 20506427. The next prime is 20506441. The reversal of 20506437 is 73460502.

It is a happy number.

It is not a de Polignac number, because 20506437 - 2⁸ = 20506181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20506437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506417) 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 47 ways as a sum of consecutive naturals, for example, 43678 + ... + 44144.

It is an arithmetic number, because the mean of its divisors is an integer number (766584).

Almost surely, 2^20506437 is an apocalyptic number.

It is an amenable number.

20506437 is a deficient number, since it is larger than the sum of its proper divisors (16289595).

20506437 is a wasteful number, since it uses less digits than its factorization.

20506437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20506437 is about 4528.4033610093. The cubic root of 20506437 is about 273.7138264581.

Adding to 20506437 its reverse (73460502), we get a palindrome (93966939).

The spelling of 20506437 in words is "twenty million, five hundred six thousand, four hundred thirty-seven".