20686374 has 16 divisors (see below), whose sum is σ = 45969840. Its totient is φ = 6895440.

The previous prime is 20686373. The next prime is 20686409. The reversal of 20686374 is 47368602.

20686374 is a `hidden beast` number, since 206 + 86 + 374 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191487 + ... + 191594.

It is an arithmetic number, because the mean of its divisors is an integer number (2873115).

Almost surely, 2^20686374 is an apocalyptic number.

20686374 is an abundant number, since it is smaller than the sum of its proper divisors (25283466).

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

20686374 is a wasteful number, since it uses less digits than its factorization.

20686374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383092 (or 383086 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20686374 is about 4548.2275668660. The cubic root of 20686374 is about 274.5120780615.

The spelling of 20686374 in words is "twenty million, six hundred eighty-six thousand, three hundred seventy-four".