20705506 has 8 divisors (see below), whose sum is σ = 31122000. Its totient is φ = 10331508.

The previous prime is 20705491. The next prime is 20705513. The reversal of 20705506 is 60550702.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9376 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (3890250).

Almost surely, 2^20705506 is an apocalyptic number.

20705506 is a deficient number, since it is larger than the sum of its proper divisors (10416494).

20705506 is a wasteful number, since it uses less digits than its factorization.

20705506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21248.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20705506 is about 4550.3303176802. The cubic root of 20705506 is about 274.5966803992.

The spelling of 20705506 in words is "twenty million, seven hundred five thousand, five hundred six".