20641699 has 8 divisors (see below), whose sum is σ = 22535072. Its totient is φ = 18792000.

The previous prime is 20641679. The next prime is 20641717. The reversal of 20641699 is 99614602.

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 20641699 - 2⁷ = 20641571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641609) 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, 9927 + ... + 11824.

It is an arithmetic number, because the mean of its divisors is an integer number (2816884).

Almost surely, 2^20641699 is an apocalyptic number.

20641699 is a deficient number, since it is larger than the sum of its proper divisors (1893373).

20641699 is a wasteful number, since it uses less digits than its factorization.

20641699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21837.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20641699 is about 4543.3136585536. The cubic root of 20641699 is about 274.3143204111.

It can be divided in two parts, 206 and 41699, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 20641699 in words is "twenty million, six hundred forty-one thousand, six hundred ninety-nine".