20021063 has 6 divisors (see below), whose sum is σ = 20929944. Its totient is φ = 19150076.

The previous prime is 20021059. The next prime is 20021069. The reversal of 20021063 is 36012002.

It is not a de Polignac number, because 20021063 - 2² = 20021059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18395 + ... + 19452.

It is an arithmetic number, because the mean of its divisors is an integer number (3488324).

Almost surely, 2^20021063 is an apocalyptic number.

20021063 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20021063 is a deficient number, since it is larger than the sum of its proper divisors (908881).

20021063 is an equidigital number, since it uses as much as digits as its factorization.

20021063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37893 (or 37870 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20021063 is about 4474.4902502967. The cubic root of 20021063 is about 271.5370178581.

Adding to 20021063 its reverse (36012002), we get a palindrome (56033065).

The spelling of 20021063 in words is "twenty million, twenty-one thousand, sixty-three".