20686550 has 24 divisors (see below), whose sum is σ = 39419352. Its totient is φ = 8072000.

The previous prime is 20686543. The next prime is 20686553. The reversal of 20686550 is 5568602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2996 + ... + 7095.

It is an arithmetic number, because the mean of its divisors is an integer number (1642473).

Almost surely, 2^20686550 is an apocalyptic number.

20686550 is a deficient number, since it is larger than the sum of its proper divisors (18732802).

20686550 is a wasteful number, since it uses less digits than its factorization.

20686550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144 (or 10139 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 20686550 is about 4548.2469150212. The cubic root of 20686550 is about 274.5128565770.

The spelling of 20686550 in words is "twenty million, six hundred eighty-six thousand, five hundred fifty".