20705712 has 20 divisors (see below), whose sum is σ = 53489880. Its totient is φ = 6901888.

The previous prime is 20705701. The next prime is 20705753. The reversal of 20705712 is 21750702.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 215637 + ... + 215732.

It is an arithmetic number, because the mean of its divisors is an integer number (2674494).

Almost surely, 2^20705712 is an apocalyptic number.

It is an amenable number.

20705712 is an abundant number, since it is smaller than the sum of its proper divisors (32784168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705712 is a wasteful number, since it uses less digits than its factorization.

20705712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431380 (or 431374 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20705712 is about 4550.3529533433. The cubic root of 20705712 is about 274.5975910544.

The spelling of 20705712 in words is "twenty million, seven hundred five thousand, seven hundred twelve".