20646154 has 4 divisors (see below), whose sum is σ = 30969234. Its totient is φ = 10323076.

The previous prime is 20646151. The next prime is 20646163. The reversal of 20646154 is 45164602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 1505529 = 4375^2 + 1227^2 .

It is not an unprimeable number, because it can be changed into a prime (20646151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161537 + ... + 5161540.

Almost surely, 2^20646154 is an apocalyptic number.

20646154 is a deficient number, since it is larger than the sum of its proper divisors (10323080).

20646154 is a wasteful number, since it uses less digits than its factorization.

20646154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323079.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20646154 is about 4543.8039130227. The cubic root of 20646154 is about 274.3340536444.

It can be divided in two parts, 206 and 46154, that added together give a triangular number (46360 = T₃₀₄).

The spelling of 20646154 in words is "twenty million, six hundred forty-six thousand, one hundred fifty-four".