20455402 has 8 divisors (see below), whose sum is σ = 33472512. Its totient is φ = 9297900.

The previous prime is 20455397. The next prime is 20455417.

20455402 is nontrivially palindromic in base 10.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 929791 = 20455402 / (2 + 0 + 4 + 5 + 5 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464874 + ... + 464917.

It is an arithmetic number, because the mean of its divisors is an integer number (4184064).

Almost surely, 2^20455402 is an apocalyptic number.

20455402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20455402 is a deficient number, since it is larger than the sum of its proper divisors (13017110).

20455402 is a wasteful number, since it uses less digits than its factorization.

20455402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929804.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20455402 is about 4522.7648623381. The cubic root of 20455402 is about 273.4865711572.

It can be divided in two parts, 2045 and 5402, that added together give a palindrome (7447).

The spelling of 20455402 in words is "twenty million, four hundred fifty-five thousand, four hundred two".