20987292 has 12 divisors (see below), whose sum is σ = 48970376. Its totient is φ = 6995760.

The previous prime is 20987287. The next prime is 20987321. The reversal of 20987292 is 29278902.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20987292.

It is a congruent 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, 874459 + ... + 874482.

Almost surely, 2^20987292 is an apocalyptic number.

It is an amenable number.

20987292 is an abundant number, since it is smaller than the sum of its proper divisors (27983084).

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

20987292 is a wasteful number, since it uses less digits than its factorization.

20987292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748948 (or 1748946 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20987292 is about 4581.1889286516. The cubic root of 20987292 is about 275.8367549667.

The spelling of 20987292 in words is "twenty million, nine hundred eighty-seven thousand, two hundred ninety-two".