20021071 has 16 divisors (see below), whose sum is σ = 23777280. Its totient is φ = 16496640.

The previous prime is 20021069. The next prime is 20021081. The reversal of 20021071 is 17012002.

It is a cyclic number.

It is not a de Polignac number, because 20021071 - 2¹ = 20021069 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 (20021021) 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, 55590 + ... + 55948.

It is an arithmetic number, because the mean of its divisors is an integer number (1486080).

Almost surely, 2^20021071 is an apocalyptic number.

20021071 is a deficient number, since it is larger than the sum of its proper divisors (3756209).

20021071 is a wasteful number, since it uses less digits than its factorization.

20021071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 20021071 is about 4474.4911442532. The cubic root of 20021071 is about 271.5370540249.

Adding to 20021071 its reverse (17012002), we get a palindrome (37033073).

The spelling of 20021071 in words is "twenty million, twenty-one thousand, seventy-one".