20021043 has 16 divisors (see below), whose sum is σ = 30735360. Its totient is φ = 11355456.

The previous prime is 20021021. The next prime is 20021059. The reversal of 20021043 is 34012002.

It is not a de Polignac number, because 20021043 - 2⁹ = 20020531 is a prime.

It is a super-3 number, since 3×20021043³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20021093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (1920960).

Almost surely, 2^20021043 is an apocalyptic number.

20021043 is a deficient number, since it is larger than the sum of its proper divisors (10714317).

20021043 is a wasteful number, since it uses less digits than its factorization.

20021043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7106.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20021043 is about 4474.4880154047. The cubic root of 20021043 is about 271.5369274409.

Adding to 20021043 its reverse (34012002), we get a palindrome (54033045).

The spelling of 20021043 in words is "twenty million, twenty-one thousand, forty-three".