20419639 has 2 divisors, whose sum is σ = 20419640. Its totient is φ = 20419638.

The previous prime is 20419631. The next prime is 20419697. The reversal of 20419639 is 93691402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20419639 - 2³ = 20419631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20419631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10209819 + 10209820.

It is an arithmetic number, because the mean of its divisors is an integer number (10209820).

Almost surely, 2^20419639 is an apocalyptic number.

20419639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20419639 is an equidigital number, since it uses as much as digits as its factorization.

20419639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20419639 is about 4518.8094671052. The cubic root of 20419639 is about 273.3270956670.

The spelling of 20419639 in words is "twenty million, four hundred nineteen thousand, six hundred thirty-nine".