20670884 has 12 divisors (see below), whose sum is σ = 38956764. Its totient is φ = 9540384.

The previous prime is 20670877. The next prime is 20670889. The reversal of 20670884 is 48807602.

It can be written as a sum of positive squares in 2 ways, for example, as 4494400 + 16176484 = 2120^2 + 4022^2 .

It is not an unprimeable number, because it can be changed into a prime (20670889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198707 + ... + 198810.

It is an arithmetic number, because the mean of its divisors is an integer number (3246397).

Almost surely, 2^20670884 is an apocalyptic number.

It is an amenable number.

20670884 is a deficient number, since it is larger than the sum of its proper divisors (18285880).

20670884 is a wasteful number, since it uses less digits than its factorization.

20670884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397534 (or 397532 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20670884 is about 4546.5243868256. The cubic root of 20670884 is about 274.4435425466.

The spelling of 20670884 in words is "twenty million, six hundred seventy thousand, eight hundred eighty-four".