20021075 has 12 divisors (see below), whose sum is σ = 24936648. Its totient is φ = 15945600.

The previous prime is 20021069. The next prime is 20021081. The reversal of 20021075 is 57012002.

It is an interprime number because it is at equal distance from previous prime (20021069) and next prime (20021081).

It is not a de Polignac number, because 20021075 - 2⁴ = 20021059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4364 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (2078054).

Almost surely, 2^20021075 is an apocalyptic number.

20021075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20021075 is a deficient number, since it is larger than the sum of its proper divisors (4915573).

20021075 is a wasteful number, since it uses less digits than its factorization.

20021075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574 (or 3569 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20021075 is about 4474.4915912313. The cubic root of 20021075 is about 271.5370721083.

Adding to 20021075 its reverse (57012002), we get a palindrome (77033077).

The spelling of 20021075 in words is "twenty million, twenty-one thousand, seventy-five".