20605712 has 10 divisors (see below), whose sum is σ = 39923598. Its totient is φ = 10302848.

The previous prime is 20605703. The next prime is 20605721. The reversal of 20605712 is 21750602.

It is an interprime number because it is at equal distance from previous prime (20605703) and next prime (20605721).

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 4477456 = 4016^2 + 2116^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643913 + ... + 643944.

Almost surely, 2^20605712 is an apocalyptic number.

It is an amenable number.

20605712 is a deficient number, since it is larger than the sum of its proper divisors (19317886).

20605712 is a wasteful number, since it uses less digits than its factorization.

20605712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287865 (or 1287859 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20605712 is about 4539.3514955333. The cubic root of 20605712 is about 274.1548133237.

The spelling of 20605712 in words is "twenty million, six hundred five thousand, seven hundred twelve".