20013686 has 16 divisors (see below), whose sum is σ = 37428480. Its totient is φ = 7797480.

The previous prime is 20013671. The next prime is 20013689. The reversal of 20013686 is 68631002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64826 + ... + 65133.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^20013686 is an apocalyptic number.

20013686 is a deficient number, since it is larger than the sum of its proper divisors (17414794).

20013686 is a wasteful number, since it uses less digits than its factorization.

20013686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129979.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20013686 is about 4473.6658346372. The cubic root of 20013686 is about 271.5036634077.

Adding to 20013686 its reverse (68631002), we get a palindrome (88644688).

The spelling of 20013686 in words is "twenty million, thirteen thousand, six hundred eighty-six".