20623679 has 4 divisors (see below), whose sum is σ = 20641320. Its totient is φ = 20606040.

The previous prime is 20623643. The next prime is 20623693. The reversal of 20623679 is 97632602.

It is a happy number.

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 20623679 - 2¹⁶ = 20558143 is a prime.

It is a super-2 number, since 2×20623679² = 850672270990082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623609) 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, 6932 + ... + 9449.

It is an arithmetic number, because the mean of its divisors is an integer number (5160330).

Almost surely, 2^20623679 is an apocalyptic number.

20623679 is a deficient number, since it is larger than the sum of its proper divisors (17641).

20623679 is a wasteful number, since it uses less digits than its factorization.

20623679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17640.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 20623679 is about 4541.3300915040. The cubic root of 20623679 is about 274.2344726041.

The spelling of 20623679 in words is "twenty million, six hundred twenty-three thousand, six hundred seventy-nine".