20628887 has 2 divisors, whose sum is σ = 20628888. Its totient is φ = 20628886.

The previous prime is 20628859. The next prime is 20628899. The reversal of 20628887 is 78882602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20628887 - 2⁶ = 20628823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314443 + 10314444.

It is an arithmetic number, because the mean of its divisors is an integer number (10314444).

Almost surely, 2^20628887 is an apocalyptic number.

20628887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628887 is an equidigital number, since it uses as much as digits as its factorization.

20628887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 20628887 is about 4541.9034556010. The cubic root of 20628887 is about 274.2575543723.

The spelling of 20628887 in words is "twenty million, six hundred twenty-eight thousand, eight hundred eighty-seven".