20609667 has 32 divisors (see below), whose sum is σ = 33384960. Its totient is φ = 12489120.

The previous prime is 20609653. The next prime is 20609683. The reversal of 20609667 is 76690602.

It is not a de Polignac number, because 20609667 - 2⁷ = 20609539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20609867) 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 31 ways as a sum of consecutive naturals, for example, 24508 + ... + 25334.

It is an arithmetic number, because the mean of its divisors is an integer number (1043280).

Almost surely, 2^20609667 is an apocalyptic number.

20609667 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20609667 is a deficient number, since it is larger than the sum of its proper divisors (12775293).

20609667 is a wasteful number, since it uses less digits than its factorization.

20609667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20609667 is about 4539.7871095460. The cubic root of 20609667 is about 274.1723523589.

The spelling of 20609667 in words is "twenty million, six hundred nine thousand, six hundred sixty-seven".