20715623 has 2 divisors, whose sum is σ = 20715624. Its totient is φ = 20715622.

The previous prime is 20715589. The next prime is 20715641. The reversal of 20715623 is 32651702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20715623 - 2¹⁰ = 20714599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20715592 and 20715601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20715683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10357811 + 10357812.

It is an arithmetic number, because the mean of its divisors is an integer number (10357812).

Almost surely, 2^20715623 is an apocalyptic number.

20715623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20715623 is an equidigital number, since it uses as much as digits as its factorization.

20715623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20715623 is about 4551.4418594551. The cubic root of 20715623 is about 274.6413970440.

The spelling of 20715623 in words is "twenty million, seven hundred fifteen thousand, six hundred twenty-three".