20619139 has 2 divisors, whose sum is σ = 20619140. Its totient is φ = 20619138.

The previous prime is 20619107. The next prime is 20619163. The reversal of 20619139 is 93191602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20619139 - 2⁵ = 20619107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20619139.

It is not a weakly prime, because it can be changed into another prime (20619169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309569 + 10309570.

It is an arithmetic number, because the mean of its divisors is an integer number (10309570).

Almost surely, 2^20619139 is an apocalyptic number.

20619139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20619139 is an equidigital number, since it uses as much as digits as its factorization.

20619139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 20619139 is about 4540.8302104351. The cubic root of 20619139 is about 274.2143482304.

The spelling of 20619139 in words is "twenty million, six hundred nineteen thousand, one hundred thirty-nine".