20274643 has 2 divisors, whose sum is σ = 20274644. Its totient is φ = 20274642.

The previous prime is 20274641. The next prime is 20274647. The reversal of 20274643 is 34647202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20274643 - 2¹ = 20274641 is a prime.

It is a super-2 number, since 2×20274643² = 822122297554898, which contains 22 as substring.

Together with 20274641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20274641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10137321 + 10137322.

It is an arithmetic number, because the mean of its divisors is an integer number (10137322).

Almost surely, 2^20274643 is an apocalyptic number.

20274643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20274643 is an equidigital number, since it uses as much as digits as its factorization.

20274643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20274643 is about 4502.7372785895. The cubic root of 20274643 is about 272.6786102841.

It can be divided in two parts, 2027 and 4643, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 20274643 in words is "twenty million, two hundred seventy-four thousand, six hundred forty-three".