20551037 has 4 divisors (see below), whose sum is σ = 22131900. Its totient is φ = 18970176.

The previous prime is 20551019. The next prime is 20551043. The reversal of 20551037 is 73015502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1094116 + 19456921 = 1046^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20551037 - 2⁸ = 20550781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551007) 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, 790412 + ... + 790437.

It is an arithmetic number, because the mean of its divisors is an integer number (5532975).

Almost surely, 2^20551037 is an apocalyptic number.

It is an amenable number.

20551037 is a deficient number, since it is larger than the sum of its proper divisors (1580863).

20551037 is a wasteful number, since it uses less digits than its factorization.

20551037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580862.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20551037 is about 4533.3251593064. The cubic root of 20551037 is about 273.9121186187.

Adding to 20551037 its reverse (73015502), we get a palindrome (93566539).

The spelling of 20551037 in words is "twenty million, five hundred fifty-one thousand, thirty-seven".