20988670 has 8 divisors (see below), whose sum is σ = 37779624. Its totient is φ = 8395464.

The previous prime is 20988637. The next prime is 20988677. The reversal of 20988670 is 7688902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049424 + ... + 1049443.

It is an arithmetic number, because the mean of its divisors is an integer number (4722453).

Almost surely, 2^20988670 is an apocalyptic number.

20988670 is a deficient number, since it is larger than the sum of its proper divisors (16790954).

20988670 is a wasteful number, since it uses less digits than its factorization.

20988670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098874.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 20988670 is about 4581.3393238222. The cubic root of 20988670 is about 275.8427918696.

The spelling of 20988670 in words is "twenty million, nine hundred eighty-eight thousand, six hundred seventy".