20261623 has 4 divisors (see below), whose sum is σ = 20340720. Its totient is φ = 20182528.

The previous prime is 20261621. The next prime is 20261629. The reversal of 20261623 is 32616202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32616202 = 2 ⋅16308101.

It is a cyclic number.

It is not a de Polignac number, because 20261623 - 2¹ = 20261621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20261594 and 20261603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261621) 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, 39163 + ... + 39676.

It is an arithmetic number, because the mean of its divisors is an integer number (5085180).

Almost surely, 2^20261623 is an apocalyptic number.

20261623 is a deficient number, since it is larger than the sum of its proper divisors (79097).

20261623 is an equidigital number, since it uses as much as digits as its factorization.

20261623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79096.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20261623 is about 4501.2912591833. The cubic root of 20261623 is about 272.6202280682.

Adding to 20261623 its reverse (32616202), we get a palindrome (52877825).

The spelling of 20261623 in words is "twenty million, two hundred sixty-one thousand, six hundred twenty-three".