20455401 has 16 divisors (see below), whose sum is σ = 28062144. Its totient is φ = 13246464.

The previous prime is 20455397. The next prime is 20455417. The reversal of 20455401 is 10455402.

It is not a de Polignac number, because 20455401 - 2² = 20455397 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 32845 + ... + 33461.

It is an arithmetic number, because the mean of its divisors is an integer number (1753884).

Almost surely, 2^20455401 is an apocalyptic number.

It is an amenable number.

20455401 is a deficient number, since it is larger than the sum of its proper divisors (7606743).

20455401 is a wasteful number, since it uses less digits than its factorization.

20455401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20455401 is about 4522.7647517862. The cubic root of 20455401 is about 273.4865667006.

Subtracting from 20455401 its reverse (10455402), we obtain a palindrome (9999999).

The spelling of 20455401 in words is "twenty million, four hundred fifty-five thousand, four hundred one".