20514139 has 4 divisors (see below), whose sum is σ = 20991256. Its totient is φ = 20037024.

The previous prime is 20514103. The next prime is 20514149. The reversal of 20514139 is 93141502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93141502 = 2 ⋅46570751.

It is a cyclic number.

It is not a de Polignac number, because 20514139 - 2⁹ = 20513627 is a prime.

It is a super-2 number, since 2×20514139² = 841659797822642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20514149) 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, 238494 + ... + 238579.

It is an arithmetic number, because the mean of its divisors is an integer number (5247814).

Almost surely, 2^20514139 is an apocalyptic number.

20514139 is a deficient number, since it is larger than the sum of its proper divisors (477117).

20514139 is an equidigital number, since it uses as much as digits as its factorization.

20514139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477116.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20514139 is about 4529.2536912829. The cubic root of 20514139 is about 273.7480901711.

The spelling of 20514139 in words is "twenty million, five hundred fourteen thousand, one hundred thirty-nine".