20846421 has 12 divisors (see below), whose sum is σ = 30151680. Its totient is φ = 13879080.

The previous prime is 20846417. The next prime is 20846431. The reversal of 20846421 is 12464802.

It is not a de Polignac number, because 20846421 - 2² = 20846417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20846431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10606 + ... + 12416.

It is an arithmetic number, because the mean of its divisors is an integer number (2512640).

Almost surely, 2^20846421 is an apocalyptic number.

It is an amenable number.

20846421 is a deficient number, since it is larger than the sum of its proper divisors (9305259).

20846421 is a wasteful number, since it uses less digits than its factorization.

20846421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096 (or 3093 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20846421 is about 4565.7881028361. The cubic root of 20846421 is about 275.2182113774.

The spelling of 20846421 in words is "twenty million, eight hundred forty-six thousand, four hundred twenty-one".