20987352 has 24 divisors (see below), whose sum is σ = 56840940. Its totient is φ = 6995760.

The previous prime is 20987321. The next prime is 20987353. The reversal of 20987352 is 25378902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20987353) 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 5 ways as a sum of consecutive naturals, for example, 145674 + ... + 145817.

Almost surely, 2^20987352 is an apocalyptic number.

It is an amenable number.

20987352 is an abundant number, since it is smaller than the sum of its proper divisors (35853588).

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

20987352 is a wasteful number, since it uses less digits than its factorization.

20987352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291503 (or 291496 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20987352 is about 4581.1954771653. The cubic root of 20987352 is about 275.8370178272.

The spelling of 20987352 in words is "twenty million, nine hundred eighty-seven thousand, three hundred fifty-two".