20953887 has 4 divisors (see below), whose sum is σ = 27938520. Its totient is φ = 13969256.

The previous prime is 20953883. The next prime is 20953901. The reversal of 20953887 is 78835902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20953887 - 2² = 20953883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3492312 + ... + 3492317.

It is an arithmetic number, because the mean of its divisors is an integer number (6984630).

Almost surely, 2^20953887 is an apocalyptic number.

20953887 is a deficient number, since it is larger than the sum of its proper divisors (6984633).

20953887 is an equidigital number, since it uses as much as digits as its factorization.

20953887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6984632.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20953887 is about 4577.5415891065. The cubic root of 20953887 is about 275.6903295350.

The spelling of 20953887 in words is "twenty million, nine hundred fifty-three thousand, eight hundred eighty-seven".