20155039 has 2 divisors, whose sum is σ = 20155040. Its totient is φ = 20155038.

The previous prime is 20155021. The next prime is 20155073. The reversal of 20155039 is 93055102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20155039 - 2⁹ = 20154527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20152039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077519 + 10077520.

It is an arithmetic number, because the mean of its divisors is an integer number (10077520).

Almost surely, 2^20155039 is an apocalyptic number.

20155039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155039 is an equidigital number, since it uses as much as digits as its factorization.

20155039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20155039 is about 4489.4363788788. The cubic root of 20155039 is about 272.1413580044.

The spelling of 20155039 in words is "twenty million, one hundred fifty-five thousand, thirty-nine".