20939419 has 2 divisors, whose sum is σ = 20939420. Its totient is φ = 20939418.

The previous prime is 20939389. The next prime is 20939459. The reversal of 20939419 is 91493902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20939419 is a prime.

It is a super-2 number, since 2×20939419² = 876918536115122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20939459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469709 + 10469710.

It is an arithmetic number, because the mean of its divisors is an integer number (10469710).

Almost surely, 2^20939419 is an apocalyptic number.

20939419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939419 is an equidigital number, since it uses as much as digits as its factorization.

20939419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 20939419 is about 4575.9609919666. The cubic root of 20939419 is about 275.6268630914.

The spelling of 20939419 in words is "twenty million, nine hundred thirty-nine thousand, four hundred nineteen".