20811704 has 8 divisors (see below), whose sum is σ = 39021960. Its totient is φ = 10405848.

The previous prime is 20811691. The next prime is 20811731. The reversal of 20811704 is 40711802.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20811704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300724 + ... + 1300739.

It is an arithmetic number, because the mean of its divisors is an integer number (4877745).

Almost surely, 2^20811704 is an apocalyptic number.

It is an amenable number.

20811704 is a deficient number, since it is larger than the sum of its proper divisors (18210256).

20811704 is a wasteful number, since it uses less digits than its factorization.

20811704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601469 (or 2601465 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20811704 is about 4561.9846558269. The cubic root of 20811704 is about 275.0653464544.

The spelling of 20811704 in words is "twenty million, eight hundred eleven thousand, seven hundred four".