20388674 has 4 divisors (see below), whose sum is σ = 30583014. Its totient is φ = 10194336.

The previous prime is 20388583. The next prime is 20388727. The reversal of 20388674 is 47688302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47688302 = 2 ⋅23844151.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 75625 = 4507^2 + 275^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5097167 + ... + 5097170.

Almost surely, 2^20388674 is an apocalyptic number.

20388674 is a deficient number, since it is larger than the sum of its proper divisors (10194340).

20388674 is a wasteful number, since it uses less digits than its factorization.

20388674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10194339.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20388674 is about 4515.3819329045. The cubic root of 20388674 is about 273.1888650928.

The spelling of 20388674 in words is "twenty million, three hundred eighty-eight thousand, six hundred seventy-four".