20712839 has 6 divisors (see below), whose sum is σ = 24094584. Its totient is φ = 17753820.

The previous prime is 20712829. The next prime is 20712841. The reversal of 20712839 is 93821702.

It is not a de Polignac number, because 20712839 - 2⁴ = 20712823 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 (20712829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211307 + ... + 211404.

It is an arithmetic number, because the mean of its divisors is an integer number (4015764).

Almost surely, 2^20712839 is an apocalyptic number.

20712839 is a deficient number, since it is larger than the sum of its proper divisors (3381745).

20712839 is an equidigital number, since it uses as much as digits as its factorization.

20712839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422725 (or 422718 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20712839 is about 4551.1360120304. The cubic root of 20712839 is about 274.6290933525.

The spelling of 20712839 in words is "twenty million, seven hundred twelve thousand, eight hundred thirty-nine".