20646454 has 4 divisors (see below), whose sum is σ = 30969684. Its totient is φ = 10323226.

The previous prime is 20646443. The next prime is 20646467. The reversal of 20646454 is 45464602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45464602 = 2 ⋅22732301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161612 + ... + 5161615.

It is an arithmetic number, because the mean of its divisors is an integer number (7742421).

Almost surely, 2^20646454 is an apocalyptic number.

20646454 is a deficient number, since it is larger than the sum of its proper divisors (10323230).

20646454 is a wasteful number, since it uses less digits than its factorization.

20646454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323229.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 20646454 is about 4543.8369248907. The cubic root of 20646454 is about 274.3353823797.

The spelling of 20646454 in words is "twenty million, six hundred forty-six thousand, four hundred fifty-four".