20723623 has 4 divisors (see below), whose sum is σ = 21814360. Its totient is φ = 19632888.

The previous prime is 20723617. The next prime is 20723627. The reversal of 20723623 is 32632702.

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 20723623 - 2⁹ = 20723111 is a prime.

It is a super-2 number, since 2×20723623² = 858937100492258, 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 (20723627) 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, 545340 + ... + 545377.

It is an arithmetic number, because the mean of its divisors is an integer number (5453590).

Almost surely, 2^20723623 is an apocalyptic number.

20723623 is a deficient number, since it is larger than the sum of its proper divisors (1090737).

20723623 is a wasteful number, since it uses less digits than its factorization.

20723623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090736.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 20723623 is about 4552.3206170040. The cubic root of 20723623 is about 274.6767463454.

The spelling of 20723623 in words is "twenty million, seven hundred twenty-three thousand, six hundred twenty-three".