20012257 has 4 divisors (see below), whose sum is σ = 20021440. Its totient is φ = 20003076.

The previous prime is 20012219. The next prime is 20012261. The reversal of 20012257 is 75221002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75221002 = 2 ⋅37610501.

It is a cyclic number.

It is not a de Polignac number, because 20012257 - 2¹¹ = 20010209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012207) 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, 748 + ... + 6370.

It is an arithmetic number, because the mean of its divisors is an integer number (5005360).

Almost surely, 2^20012257 is an apocalyptic number.

It is an amenable number.

20012257 is a deficient number, since it is larger than the sum of its proper divisors (9183).

20012257 is an equidigital number, since it uses as much as digits as its factorization.

20012257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20012257 is about 4473.5061193654. The cubic root of 20012257 is about 271.4972013635.

Adding to 20012257 its reverse (75221002), we get a palindrome (95233259).

The spelling of 20012257 in words is "twenty million, twelve thousand, two hundred fifty-seven".