20120839 has 2 divisors, whose sum is σ = 20120840. Its totient is φ = 20120838.

The previous prime is 20120833. The next prime is 20120851. The reversal of 20120839 is 93802102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120839 - 2¹⁵ = 20088071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060419 + 10060420.

It is an arithmetic number, because the mean of its divisors is an integer number (10060420).

Almost surely, 2^20120839 is an apocalyptic number.

20120839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120839 is an equidigital number, since it uses as much as digits as its factorization.

20120839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20120839 is about 4485.6258203288. The cubic root of 20120839 is about 271.9873435215.

The spelling of 20120839 in words is "twenty million, one hundred twenty thousand, eight hundred thirty-nine".