20641888 has 24 divisors (see below), whose sum is σ = 40742352. Its totient is φ = 10294656.

The previous prime is 20641871. The next prime is 20641909. The reversal of 20641888 is 88814602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20206 + ... + 21202.

It is an arithmetic number, because the mean of its divisors is an integer number (1697598).

Almost surely, 2^20641888 is an apocalyptic number.

It is an amenable number.

20641888 is a deficient number, since it is larger than the sum of its proper divisors (20100464).

20641888 is an equidigital number, since it uses as much as digits as its factorization.

20641888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 20641888 is about 4543.3344583026. The cubic root of 20641888 is about 274.3151576362.

The spelling of 20641888 in words is "twenty million, six hundred forty-one thousand, eight hundred eighty-eight".