20974885 has 8 divisors (see below), whose sum is σ = 25214976. Its totient is φ = 16749840.

The previous prime is 20974883. The next prime is 20974901. The reversal of 20974885 is 58847902.

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

It is not a de Polignac number, because 20974885 - 2¹ = 20974883 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 (20974883) 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, 421 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (3151872).

Almost surely, 2^20974885 is an apocalyptic number.

It is an amenable number.

20974885 is a deficient number, since it is larger than the sum of its proper divisors (4240091).

20974885 is an equidigital number, since it uses as much as digits as its factorization.

20974885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7523.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 20974885 is about 4579.8346040005. The cubic root of 20974885 is about 275.7823890322.

The spelling of 20974885 in words is "twenty million, nine hundred seventy-four thousand, eight hundred eighty-five".