20987346 has 8 divisors (see below), whose sum is σ = 41974704. Its totient is φ = 6995780.

The previous prime is 20987321. The next prime is 20987353. The reversal of 20987346 is 64378902.

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

20987346 is an admirable number.

It is an unprimeable number.

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, 1748940 + ... + 1748951.

It is an arithmetic number, because the mean of its divisors is an integer number (5246838).

Almost surely, 2^20987346 is an apocalyptic number.

20987346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20987346 is a wasteful number, since it uses less digits than its factorization.

20987346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497896.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20987346 is about 4581.1948223144. The cubic root of 20987346 is about 275.8369915412.

The spelling of 20987346 in words is "twenty million, nine hundred eighty-seven thousand, three hundred forty-six".