20402454 has 8 divisors (see below), whose sum is σ = 40804920. Its totient is φ = 6800816.

The previous prime is 20402443. The next prime is 20402467. The reversal of 20402454 is 45420402.

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

20402454 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402454.

It is a congruent number.

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, 1700199 + ... + 1700210.

It is an arithmetic number, because the mean of its divisors is an integer number (5100615).

Almost surely, 2^20402454 is an apocalyptic number.

20402454 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20402454 is a wasteful number, since it uses less digits than its factorization.

20402454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400414.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20402454 is about 4516.9075704513. The cubic root of 20402454 is about 273.2503975360.

Adding to 20402454 its reverse (45420402), we get a palindrome (65822856).

The spelling of 20402454 in words is "twenty million, four hundred two thousand, four hundred fifty-four".