20514839 has 4 divisors (see below), whose sum is σ = 21176640. Its totient is φ = 19853040.

The previous prime is 20514833. The next prime is 20514841. The reversal of 20514839 is 93841502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93841502 = 2 ⋅46920751.

It is a cyclic number.

It is not a de Polignac number, because 20514839 - 2⁸ = 20514583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20514833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330854 + ... + 330915.

It is an arithmetic number, because the mean of its divisors is an integer number (5294160).

Almost surely, 2^20514839 is an apocalyptic number.

20514839 is a deficient number, since it is larger than the sum of its proper divisors (661801).

20514839 is an equidigital number, since it uses as much as digits as its factorization.

20514839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661800.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20514839 is about 4529.3309660479. The cubic root of 20514839 is about 273.7512038200.

The spelling of 20514839 in words is "twenty million, five hundred fourteen thousand, eight hundred thirty-nine".