20646069 has 8 divisors (see below), whose sum is σ = 27697632. Its totient is φ = 13679280.

The previous prime is 20646061. The next prime is 20646071. The reversal of 20646069 is 96064602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20646069 - 2³ = 20646061 is a prime.

It is a super-2 number, since 2×20646069² = 852520330305522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20622 + ... + 21599.

It is an arithmetic number, because the mean of its divisors is an integer number (3462204).

Almost surely, 2^20646069 is an apocalyptic number.

It is an amenable number.

20646069 is a deficient number, since it is larger than the sum of its proper divisors (7051563).

20646069 is a wasteful number, since it uses less digits than its factorization.

20646069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42387.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20646069 is about 4543.7945596164. The cubic root of 20646069 is about 274.3336771671. Note that the first 3 decimals are identical.

The spelling of 20646069 in words is "twenty million, six hundred forty-six thousand, sixty-nine".