20699140 has 48 divisors (see below), whose sum is σ = 54198144. Its totient is φ = 6451200.

The previous prime is 20699131. The next prime is 20699141. The reversal of 20699140 is 4199602.

It is a happy number.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20699141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5181 + ... + 8260.

It is an arithmetic number, because the mean of its divisors is an integer number (1129128).

Almost surely, 2^20699140 is an apocalyptic number.

20699140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20699140 is an abundant number, since it is smaller than the sum of its proper divisors (33499004).

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

20699140 is a wasteful number, since it uses less digits than its factorization.

20699140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468 (or 13466 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20699140 is about 4549.6307542481. The cubic root of 20699140 is about 274.5685355240.

The spelling of 20699140 in words is "twenty million, six hundred ninety-nine thousand, one hundred forty".