20855493 has 12 divisors (see below), whose sum is σ = 30488640. Its totient is φ = 13735656.

The previous prime is 20855491. The next prime is 20855501. The reversal of 20855493 is 39455802.

It is not a de Polignac number, because 20855493 - 2¹ = 20855491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855491) 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, 13213 + ... + 14706.

It is an arithmetic number, because the mean of its divisors is an integer number (2540720).

Almost surely, 2^20855493 is an apocalyptic number.

It is an amenable number.

20855493 is a deficient number, since it is larger than the sum of its proper divisors (9633147).

20855493 is a wasteful number, since it uses less digits than its factorization.

20855493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28008 (or 28005 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 20855493 is about 4566.7814705764. The cubic root of 20855493 is about 275.2581289811.

The spelling of 20855493 in words is "twenty million, eight hundred fifty-five thousand, four hundred ninety-three".