20612537 has 4 divisors (see below), whose sum is σ = 22486416. Its totient is φ = 18738660.

The previous prime is 20612521. The next prime is 20612539. The reversal of 20612537 is 73521602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20612537 - 2⁴ = 20612521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20612539) 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 3 ways as a sum of consecutive naturals, for example, 936923 + ... + 936944.

It is an arithmetic number, because the mean of its divisors is an integer number (5621604).

Almost surely, 2^20612537 is an apocalyptic number.

It is an amenable number.

20612537 is a deficient number, since it is larger than the sum of its proper divisors (1873879).

20612537 is a wasteful number, since it uses less digits than its factorization.

20612537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873878.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20612537 is about 4540.1031926598. The cubic root of 20612537 is about 274.1850783955.

The spelling of 20612537 in words is "twenty million, six hundred twelve thousand, five hundred thirty-seven".