20616623 has 2 divisors, whose sum is σ = 20616624. Its totient is φ = 20616622.

The previous prime is 20616601. The next prime is 20616647. The reversal of 20616623 is 32661602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20616623 - 2⁶ = 20616559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20616592 and 20616601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308311 + 10308312.

It is an arithmetic number, because the mean of its divisors is an integer number (10308312).

Almost surely, 2^20616623 is an apocalyptic number.

20616623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616623 is an equidigital number, since it uses as much as digits as its factorization.

20616623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20616623 is about 4540.5531601337. The cubic root of 20616623 is about 274.2031943316.

The spelling of 20616623 in words is "twenty million, six hundred sixteen thousand, six hundred twenty-three".