20120251 has 2 divisors, whose sum is σ = 20120252. Its totient is φ = 20120250.

The previous prime is 20120237. The next prime is 20120257. The reversal of 20120251 is 15202102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20120251 - 2¹⁹ = 19595963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20120257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060125 + 10060126.

It is an arithmetic number, because the mean of its divisors is an integer number (10060126).

Almost surely, 2^20120251 is an apocalyptic number.

20120251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120251 is an equidigital number, since it uses as much as digits as its factorization.

20120251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20120251 is about 4485.5602771560. The cubic root of 20120251 is about 271.9846940277.

Adding to 20120251 its reverse (15202102), we get a palindrome (35322353).

The spelling of 20120251 in words is "twenty million, one hundred twenty thousand, two hundred fifty-one".