20555493 has 16 divisors (see below), whose sum is σ = 31464576. Its totient is φ = 11692800.

The previous prime is 20555489. The next prime is 20555501. The reversal of 20555493 is 39455502.

It is not a de Polignac number, because 20555493 - 2² = 20555489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2793 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (1966536).

Almost surely, 2^20555493 is an apocalyptic number.

It is an amenable number.

20555493 is a deficient number, since it is larger than the sum of its proper divisors (10909083).

20555493 is a wasteful number, since it uses less digits than its factorization.

20555493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 20555493 is about 4533.8166041427. The cubic root of 20555493 is about 273.9319142815.

The spelling of 20555493 in words is "twenty million, five hundred fifty-five thousand, four hundred ninety-three".