20609506 has 8 divisors (see below), whose sum is σ = 31337964. Its totient is φ = 10163520.

The previous prime is 20609489. The next prime is 20609507. The reversal of 20609506 is 60590602.

It can be written as a sum of positive squares in 2 ways, for example, as 18533025 + 2076481 = 4305^2 + 1441^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20609507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70435 + ... + 70726.

Almost surely, 2^20609506 is an apocalyptic number.

20609506 is a deficient number, since it is larger than the sum of its proper divisors (10728458).

20609506 is a wasteful number, since it uses less digits than its factorization.

20609506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141236.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20609506 is about 4539.7693774023. The cubic root of 20609506 is about 274.1716384243.

It can be divided in two parts, 20609 and 506, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20609506 in words is "twenty million, six hundred nine thousand, five hundred six".