20452643 has 2 divisors, whose sum is σ = 20452644. Its totient is φ = 20452642.

The previous prime is 20452639. The next prime is 20452667. The reversal of 20452643 is 34625402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20452643 - 2² = 20452639 is a prime.

It is not a weakly prime, because it can be changed into another prime (20452673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226321 + 10226322.

It is an arithmetic number, because the mean of its divisors is an integer number (10226322).

Almost surely, 2^20452643 is an apocalyptic number.

20452643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20452643 is an equidigital number, since it uses as much as digits as its factorization.

20452643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20452643 is about 4522.4598395121. The cubic root of 20452643 is about 273.4742747579.

The spelling of 20452643 in words is "twenty million, four hundred fifty-two thousand, six hundred forty-three".