20140688 has 20 divisors (see below), whose sum is σ = 39150768. Its totient is φ = 10037280.

The previous prime is 20140667. The next prime is 20140739. The reversal of 20140688 is 88604102.

It is a super-2 number, since 2×20140688² = 811294626226688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20140688.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395 + ... + 7197.

Almost surely, 2^20140688 is an apocalyptic number.

It is an amenable number.

20140688 is a deficient number, since it is larger than the sum of its proper divisors (19010080).

20140688 is a wasteful number, since it uses less digits than its factorization.

20140688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142 (or 4136 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20140688 is about 4487.8377867298. The cubic root of 20140688 is about 272.0767516969.

The spelling of 20140688 in words is "twenty million, one hundred forty thousand, six hundred eighty-eight".