20246021 has 2 divisors, whose sum is σ = 20246022. Its totient is φ = 20246020.

The previous prime is 20246011. The next prime is 20246029. The reversal of 20246021 is 12064202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 6100900 = 3761^2 + 2470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20246021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20246029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10123010 + 10123011.

It is an arithmetic number, because the mean of its divisors is an integer number (10123011).

Almost surely, 2^20246021 is an apocalyptic number.

It is an amenable number.

20246021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20246021 is an equidigital number, since it uses as much as digits as its factorization.

20246021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20246021 is about 4499.5578671687. The cubic root of 20246021 is about 272.5502351064.

The spelling of 20246021 in words is "twenty million, two hundred forty-six thousand, twenty-one".