20681910 has 24 divisors (see below), whose sum is σ = 53773200. Its totient is φ = 5515152.

The previous prime is 20681893. The next prime is 20681933. The reversal of 20681910 is 1918602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114810 + ... + 114989.

It is an arithmetic number, because the mean of its divisors is an integer number (2240550).

Almost surely, 2^20681910 is an apocalyptic number.

20681910 is an abundant number, since it is smaller than the sum of its proper divisors (33091290).

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

20681910 is a wasteful number, since it uses less digits than its factorization.

20681910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229812 (or 229809 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20681910 is about 4547.7367997719. The cubic root of 20681910 is about 274.4923306008.

The spelling of 20681910 in words is "twenty million, six hundred eighty-one thousand, nine hundred ten".