20864069 has 4 divisors (see below), whose sum is σ = 20924544. Its totient is φ = 20803596.

The previous prime is 20864047. The next prime is 20864087. The reversal of 20864069 is 96046802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96046802 = 2 ⋅48023401.

It is a cyclic number.

It is not a de Polignac number, because 20864069 - 2⁸ = 20863813 is a prime.

It is a super-2 number, since 2×20864069² = 870618750473522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29717 + ... + 30410.

It is an arithmetic number, because the mean of its divisors is an integer number (5231136).

Almost surely, 2^20864069 is an apocalyptic number.

It is an amenable number.

20864069 is a deficient number, since it is larger than the sum of its proper divisors (60475).

20864069 is an equidigital number, since it uses as much as digits as its factorization.

20864069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60474.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20864069 is about 4567.7203285665. The cubic root of 20864069 is about 275.2958534983.

The spelling of 20864069 in words is "twenty million, eight hundred sixty-four thousand, sixty-nine".