20481623 has 2 divisors, whose sum is σ = 20481624. Its totient is φ = 20481622.

The previous prime is 20481599. The next prime is 20481641. The reversal of 20481623 is 32618402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20481623 - 2²⁰ = 19433047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20481592 and 20481601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20481023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240811 + 10240812.

It is an arithmetic number, because the mean of its divisors is an integer number (10240812).

Almost surely, 2^20481623 is an apocalyptic number.

20481623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20481623 is an equidigital number, since it uses as much as digits as its factorization.

20481623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20481623 is about 4525.6627139017. The cubic root of 20481623 is about 273.6033785976.

The spelling of 20481623 in words is "twenty million, four hundred eighty-one thousand, six hundred twenty-three".