20630237 has 4 divisors (see below), whose sum is σ = 20692896. Its totient is φ = 20567580.

The previous prime is 20630213. The next prime is 20630243. The reversal of 20630237 is 73203602.

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 a de Polignac number, because none of the positive numbers 2^k-20630237 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 (20633237) 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, 30833 + ... + 31494.

It is an arithmetic number, because the mean of its divisors is an integer number (5173224).

Almost surely, 2^20630237 is an apocalyptic number.

It is an amenable number.

20630237 is a deficient number, since it is larger than the sum of its proper divisors (62659).

20630237 is an equidigital number, since it uses as much as digits as its factorization.

20630237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62658.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 20630237 is about 4542.0520692744. The cubic root of 20630237 is about 274.2635369155.

Adding to 20630237 its reverse (73203602), we get a palindrome (93833839).

The spelling of 20630237 in words is "twenty million, six hundred thirty thousand, two hundred thirty-seven".