20455090 has 8 divisors (see below), whose sum is σ = 36819180. Its totient is φ = 8182032.

The previous prime is 20455087. The next prime is 20455091. The reversal of 20455090 is 9055402.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 1121481 = 4397^2 + 1059^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20455091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022745 + ... + 1022764.

Almost surely, 2^20455090 is an apocalyptic number.

20455090 is a deficient number, since it is larger than the sum of its proper divisors (16364090).

20455090 is a wasteful number, since it uses less digits than its factorization.

20455090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045516.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20455090 is about 4522.7303700309. The cubic root of 20455090 is about 273.4851806811.

The spelling of 20455090 in words is "twenty million, four hundred fifty-five thousand, ninety".