20455470 has 128 divisors (see below), whose sum is σ = 63590400. Its totient is φ = 4582656.

The previous prime is 20455459. The next prime is 20455483. The reversal of 20455470 is 7455402.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149242 + ... + 149378.

It is an arithmetic number, because the mean of its divisors is an integer number (496800).

Almost surely, 2^20455470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20455470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31795200).

20455470 is an abundant number, since it is smaller than the sum of its proper divisors (43134930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20455470 is a wasteful number, since it uses less digits than its factorization.

20455470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20455470 is about 4522.7723798573. The cubic root of 20455470 is about 273.4868742078.

The spelling of 20455470 in words is "twenty million, four hundred fifty-five thousand, four hundred seventy".