20794821 has 8 divisors (see below), whose sum is σ = 28316544. Its totient is φ = 13568160.

The previous prime is 20794771. The next prime is 20794847. The reversal of 20794821 is 12849702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20794821 - 2⁹ = 20794309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20794861) 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, 73600 + ... + 73881.

It is an arithmetic number, because the mean of its divisors is an integer number (3539568).

Almost surely, 2^20794821 is an apocalyptic number.

It is an amenable number.

20794821 is a deficient number, since it is larger than the sum of its proper divisors (7521723).

20794821 is a wasteful number, since it uses less digits than its factorization.

20794821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147531.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20794821 is about 4560.1338796136. The cubic root of 20794821 is about 274.9909462584.

The spelling of 20794821 in words is "twenty million, seven hundred ninety-four thousand, eight hundred twenty-one".