20805496 has 8 divisors (see below), whose sum is σ = 39010320. Its totient is φ = 10402744.

The previous prime is 20805487. The next prime is 20805497. The reversal of 20805496 is 69450802.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300336 + ... + 1300351.

It is an arithmetic number, because the mean of its divisors is an integer number (4876290).

Almost surely, 2^20805496 is an apocalyptic number.

It is an amenable number.

20805496 is a deficient number, since it is larger than the sum of its proper divisors (18204824).

20805496 is a wasteful number, since it uses less digits than its factorization.

20805496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600693 (or 2600689 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20805496 is about 4561.3041994587. The cubic root of 20805496 is about 275.0379936487.

The spelling of 20805496 in words is "twenty million, eight hundred five thousand, four hundred ninety-six".