20625599 has 2 divisors, whose sum is σ = 20625600. Its totient is φ = 20625598.

The previous prime is 20625593. The next prime is 20625617. The reversal of 20625599 is 99552602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20625599 is a prime.

It is a super-3 number, since 3×20625599³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20625593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312799 + 10312800.

It is an arithmetic number, because the mean of its divisors is an integer number (10312800).

Almost surely, 2^20625599 is an apocalyptic number.

20625599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20625599 is an equidigital number, since it uses as much as digits as its factorization.

20625599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 20625599 is about 4541.5414783970. The cubic root of 20625599 is about 274.2429824639.

It can be divided in two parts, 206255 and 99, that multiplied together give a triangular number (20419245 = T₆₃₉₀).

The spelling of 20625599 in words is "twenty million, six hundred twenty-five thousand, five hundred ninety-nine".