20703645 has 12 divisors (see below), whose sum is σ = 35886396. Its totient is φ = 11041920.

The previous prime is 20703619. The next prime is 20703653. The reversal of 20703645 is 54630702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6095961 + 14607684 = 2469^2 + 3822^2 .

It is not a de Polignac number, because 20703645 - 2¹⁰ = 20702621 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229996 + ... + 230085.

It is an arithmetic number, because the mean of its divisors is an integer number (2990533).

Almost surely, 2^20703645 is an apocalyptic number.

It is an amenable number.

20703645 is a deficient number, since it is larger than the sum of its proper divisors (15182751).

20703645 is a wasteful number, since it uses less digits than its factorization.

20703645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460092 (or 460089 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20703645 is about 4550.1258224361. The cubic root of 20703645 is about 274.5884532843.

The spelling of 20703645 in words is "twenty million, seven hundred three thousand, six hundred forty-five".