20455450 has 24 divisors (see below), whose sum is σ = 39078972. Its totient is φ = 7960320.

The previous prime is 20455447. The next prime is 20455451. The reversal of 20455450 is 5455402.

It can be written as a sum of positive squares in 6 ways, for example, as 8532241 + 11923209 = 2921^2 + 3453^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20455451) 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, 3679 + ... + 7378.

Almost surely, 2^20455450 is an apocalyptic number.

20455450 is a deficient number, since it is larger than the sum of its proper divisors (18623522).

20455450 is a wasteful number, since it uses less digits than its factorization.

20455450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11106 (or 11101 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20455450 is about 4522.7701688235. The cubic root of 20455450 is about 273.4867850754.

The spelling of 20455450 in words is "twenty million, four hundred fifty-five thousand, four hundred fifty".