20544563623 has 2 divisors, whose sum is σ = 20544563624. Its totient is φ = 20544563622.

The previous prime is 20544563603. The next prime is 20544563671. The reversal of 20544563623 is 32636544502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20544563623 - 2⁹ = 20544563111 is a prime.

It is a super-2 number, since 2×20544563623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20544563603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272281811 + 10272281812.

It is an arithmetic number, because the mean of its divisors is an integer number (10272281812).

Almost surely, 2^20544563623 is an apocalyptic number.

20544563623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544563623 is an equidigital number, since it uses as much as digits as its factorization.

20544563623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 40.

The spelling of 20544563623 in words is "twenty billion, five hundred forty-four million, five hundred sixty-three thousand, six hundred twenty-three".