20262251 has 4 divisors (see below), whose sum is σ = 20915904. Its totient is φ = 19608600.

The previous prime is 20262239. The next prime is 20262257. The reversal of 20262251 is 15226202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15226202 = 2 ⋅7613101.

It is a cyclic number.

It is not a de Polignac number, because 20262251 - 2¹⁴ = 20245867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20262257) 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, 326780 + ... + 326841.

It is an arithmetic number, because the mean of its divisors is an integer number (5228976).

Almost surely, 2^20262251 is an apocalyptic number.

20262251 is a deficient number, since it is larger than the sum of its proper divisors (653653).

20262251 is an equidigital number, since it uses as much as digits as its factorization.

20262251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653652.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20262251 is about 4501.3610164038. The cubic root of 20262251 is about 272.6230446201.

Adding to 20262251 its reverse (15226202), we get a palindrome (35488453).

The spelling of 20262251 in words is "twenty million, two hundred sixty-two thousand, two hundred fifty-one".