20623115 has 4 divisors (see below), whose sum is σ = 24747744. Its totient is φ = 16498488.

The previous prime is 20623103. The next prime is 20623117. The reversal of 20623115 is 51132602.

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

It is a cyclic number.

It is not a de Polignac number, because 20623115 - 2⁶ = 20623051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20623117) 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, 2062307 + ... + 2062316.

It is an arithmetic number, because the mean of its divisors is an integer number (6186936).

Almost surely, 2^20623115 is an apocalyptic number.

20623115 is a deficient number, since it is larger than the sum of its proper divisors (4124629).

20623115 is an equidigital number, since it uses as much as digits as its factorization.

20623115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124628.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20623115 is about 4541.2679947345. The cubic root of 20623115 is about 274.2319727325.

Adding to 20623115 its reverse (51132602), we get a palindrome (71755717).

The spelling of 20623115 in words is "twenty million, six hundred twenty-three thousand, one hundred fifteen".