20364021 has 8 divisors (see below), whose sum is σ = 30168960. Its totient is φ = 13575996.

The previous prime is 20364017. The next prime is 20364037. The reversal of 20364021 is 12046302.

It is a happy number.

20364021 is a `hidden beast` number, since 2 + 0 + 3 + 640 + 21 = 666.

It is not a de Polignac number, because 20364021 - 2² = 20364017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20363985 and 20364003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377085 + ... + 377138.

It is an arithmetic number, because the mean of its divisors is an integer number (3771120).

Almost surely, 2^20364021 is an apocalyptic number.

It is an amenable number.

20364021 is a deficient number, since it is larger than the sum of its proper divisors (9804939).

20364021 is an equidigital number, since it uses as much as digits as its factorization.

20364021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754232 (or 754226 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20364021 is about 4512.6512163029. The cubic root of 20364021 is about 273.0787117559.

The spelling of 20364021 in words is "twenty million, three hundred sixty-four thousand, twenty-one".