20606644 has 6 divisors (see below), whose sum is σ = 36061634. Its totient is φ = 10303320.

The previous prime is 20606627. The next prime is 20606681. The reversal of 20606644 is 44660602.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3467044 = 4140^2 + 1862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2575827 + ... + 2575834.

Almost surely, 2^20606644 is an apocalyptic number.

It is an amenable number.

20606644 is a deficient number, since it is larger than the sum of its proper divisors (15454990).

20606644 is a wasteful number, since it uses less digits than its factorization.

20606644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151665 (or 5151663 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20606644 is about 4539.4541522082. The cubic root of 20606644 is about 274.1589466183.

The spelling of 20606644 in words is "twenty million, six hundred six thousand, six hundred forty-four".