20880245 has 4 divisors (see below), whose sum is σ = 25056300. Its totient is φ = 16704192.

The previous prime is 20880191. The next prime is 20880257. The reversal of 20880245 is 54208802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3632836 + 17247409 = 1906^2 + 4153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20880245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2088020 + ... + 2088029.

It is an arithmetic number, because the mean of its divisors is an integer number (6264075).

Almost surely, 2^20880245 is an apocalyptic number.

It is an amenable number.

20880245 is a deficient number, since it is larger than the sum of its proper divisors (4176055).

20880245 is an equidigital number, since it uses as much as digits as its factorization.

20880245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4176054.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20880245 is about 4569.4906718364. The cubic root of 20880245 is about 275.3669811287.

The spelling of 20880245 in words is "twenty million, eight hundred eighty thousand, two hundred forty-five".