20202645 has 8 divisors (see below), whose sum is σ = 32324256. Its totient is φ = 10774736.

The previous prime is 20202631. The next prime is 20202659. The reversal of 20202645 is 54620202.

It is an interprime number because it is at equal distance from previous prime (20202631) and next prime (20202659).

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 20202645 - 2⁷ = 20202517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673407 + ... + 673436.

It is an arithmetic number, because the mean of its divisors is an integer number (4040532).

Almost surely, 2^20202645 is an apocalyptic number.

It is an amenable number.

20202645 is a deficient number, since it is larger than the sum of its proper divisors (12121611).

20202645 is a wasteful number, since it uses less digits than its factorization.

20202645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346851.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20202645 is about 4494.7352536050. The cubic root of 20202645 is about 272.3554545810.

Adding to 20202645 its reverse (54620202), we get a palindrome (74822847).

The spelling of 20202645 in words is "twenty million, two hundred two thousand, six hundred forty-five".