20021337 has 20 divisors (see below), whose sum is σ = 34182016. Its totient is φ = 11440440.

The previous prime is 20021327. The next prime is 20021341. The reversal of 20021337 is 73312002.

It is not a de Polignac number, because 20021337 - 2⁴ = 20021321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021327) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17089 + ... + 18222.

Almost surely, 2^20021337 is an apocalyptic number.

20021337 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20021337 is a deficient number, since it is larger than the sum of its proper divisors (14160679).

20021337 is an equidigital number, since it uses as much as digits as its factorization.

20021337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35330 (or 35321 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20021337 is about 4474.5208682048. The cubic root of 20021337 is about 271.5382565669.

Adding to 20021337 its reverse (73312002), we get a palindrome (93333339).

The spelling of 20021337 in words is "twenty million, twenty-one thousand, three hundred thirty-seven".