20702645 has 8 divisors (see below), whose sum is σ = 25923456. Its totient is φ = 15841936.

The previous prime is 20702641. The next prime is 20702653. The reversal of 20702645 is 54620702.

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

It is a cyclic number.

It is not a de Polignac number, because 20702645 - 2² = 20702641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20702641) 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, 89897 + ... + 90126.

It is an arithmetic number, because the mean of its divisors is an integer number (3240432).

Almost surely, 2^20702645 is an apocalyptic number.

It is an amenable number.

20702645 is a deficient number, since it is larger than the sum of its proper divisors (5220811).

20702645 is a wasteful number, since it uses less digits than its factorization.

20702645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180051.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20702645 is about 4550.0159340380. The cubic root of 20702645 is about 274.5840322774.

The spelling of 20702645 in words is "twenty million, seven hundred two thousand, six hundred forty-five".