20021069 has 2 divisors, whose sum is σ = 20021070. Its totient is φ = 20021068.

The previous prime is 20021059. The next prime is 20021081. The reversal of 20021069 is 96012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 6786025 = 3638^2 + 2605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021069 is a prime.

It is a super-2 number, since 2×20021069² = 801686407805522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20021069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010534 + 10010535.

It is an arithmetic number, because the mean of its divisors is an integer number (10010535).

Almost surely, 2^20021069 is an apocalyptic number.

It is an amenable number.

20021069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021069 is an equidigital number, since it uses as much as digits as its factorization.

20021069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20021069 is about 4474.4909207641. The cubic root of 20021069 is about 271.5370449832.

The spelling of 20021069 in words is "twenty million, twenty-one thousand, sixty-nine".