20973887 has 8 divisors (see below), whose sum is σ = 23619072. Its totient is φ = 18451800.

The previous prime is 20973877. The next prime is 20973893. The reversal of 20973887 is 78837902.

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 20973887 - 2⁴ = 20973871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973847) 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, 30413 + ... + 31094.

It is an arithmetic number, because the mean of its divisors is an integer number (2952384).

Almost surely, 2^20973887 is an apocalyptic number.

20973887 is a deficient number, since it is larger than the sum of its proper divisors (2645185).

20973887 is a wasteful number, since it uses less digits than its factorization.

20973887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61549.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 20973887 is about 4579.7256468046. The cubic root of 20973887 is about 275.7780149885.

The spelling of 20973887 in words is "twenty million, nine hundred seventy-three thousand, eight hundred eighty-seven".