20652987 has 8 divisors (see below), whose sum is σ = 28057104. Its totient is φ = 13508768.

The previous prime is 20652967. The next prime is 20653001. The reversal of 20652987 is 78925602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20652987 - 2⁶ = 20652923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20652917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64788 + ... + 65105.

It is an arithmetic number, because the mean of its divisors is an integer number (3507138).

Almost surely, 2^20652987 is an apocalyptic number.

20652987 is a deficient number, since it is larger than the sum of its proper divisors (7404117).

20652987 is a wasteful number, since it uses less digits than its factorization.

20652987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129949.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20652987 is about 4544.5557538664. Note that the first 3 decimals coincide. The cubic root of 20652987 is about 274.3643146127.

The spelling of 20652987 in words is "twenty million, six hundred fifty-two thousand, nine hundred eighty-seven".