20120851 has 2 divisors, whose sum is σ = 20120852. Its totient is φ = 20120850.

The previous prime is 20120839. The next prime is 20120887. The reversal of 20120851 is 15802102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120851 - 2⁵ = 20120819 is a prime.

It is not a weakly prime, because it can be changed into another prime (20120801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060425 + 10060426.

It is an arithmetic number, because the mean of its divisors is an integer number (10060426).

Almost surely, 2^20120851 is an apocalyptic number.

20120851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120851 is an equidigital number, since it uses as much as digits as its factorization.

20120851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20120851 is about 4485.6271579346. The cubic root of 20120851 is about 271.9873975923.

Adding to 20120851 its reverse (15802102), we get a palindrome (35922953).

The spelling of 20120851 in words is "twenty million, one hundred twenty thousand, eight hundred fifty-one".