20705937 has 8 divisors (see below), whose sum is σ = 31551936. Its totient is φ = 11831952.

The previous prime is 20705929. The next prime is 20705947. The reversal of 20705937 is 73950702.

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

It is not a de Polignac number, because 20705937 - 2³ = 20705929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20705898 and 20705907.

It is not an unprimeable number, because it can be changed into a prime (20705917) 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, 492978 + ... + 493019.

It is an arithmetic number, because the mean of its divisors is an integer number (3943992).

Almost surely, 2^20705937 is an apocalyptic number.

It is an amenable number.

20705937 is a deficient number, since it is larger than the sum of its proper divisors (10845999).

20705937 is an equidigital number, since it uses as much as digits as its factorization.

20705937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986007.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20705937 is about 4550.3776766330. The cubic root of 20705937 is about 274.5985856952.

The spelling of 20705937 in words is "twenty million, seven hundred five thousand, nine hundred thirty-seven".