20686874 has 8 divisors (see below), whose sum is σ = 33417300. Its totient is φ = 9547776.

The previous prime is 20686873. The next prime is 20686879. The reversal of 20686874 is 47868602.

It can be written as a sum of positive squares in 2 ways, for example, as 19492225 + 1194649 = 4415^2 + 1093^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20686871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397799 + ... + 397850.

Almost surely, 2^20686874 is an apocalyptic number.

20686874 is a deficient number, since it is larger than the sum of its proper divisors (12730426).

20686874 is a wasteful number, since it uses less digits than its factorization.

20686874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795664.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 20686874 is about 4548.2825330008. The cubic root of 20686874 is about 274.5142897418.

The spelling of 20686874 in words is "twenty million, six hundred eighty-six thousand, eight hundred seventy-four".