20686376 has 8 divisors (see below), whose sum is σ = 38786970. Its totient is φ = 10343184.

The previous prime is 20686373. The next prime is 20686409. The reversal of 20686376 is 67368602.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 9302500 = 3374^2 + 3050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1292891 + ... + 1292906.

Almost surely, 2^20686376 is an apocalyptic number.

It is an amenable number.

20686376 is a deficient number, since it is larger than the sum of its proper divisors (18100594).

20686376 is a wasteful number, since it uses less digits than its factorization.

20686376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585803 (or 2585799 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 20686376 is about 4548.2277867319. The cubic root of 20686376 is about 274.5120869083.

The spelling of 20686376 in words is "twenty million, six hundred eighty-six thousand, three hundred seventy-six".