20681934 has 32 divisors (see below), whose sum is σ = 50910720. Its totient is φ = 5454432.

The previous prime is 20681933. The next prime is 20681939. The reversal of 20681934 is 43918602.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20681895 and 20681904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18394 + ... + 19485.

It is an arithmetic number, because the mean of its divisors is an integer number (1590960).

Almost surely, 2^20681934 is an apocalyptic number.

20681934 is an abundant number, since it is smaller than the sum of its proper divisors (30228786).

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

20681934 is a wasteful number, since it uses less digits than its factorization.

20681934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37904.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20681934 is about 4547.7394384463. The cubic root of 20681934 is about 274.4924367776.

The spelling of 20681934 in words is "twenty million, six hundred eighty-one thousand, nine hundred thirty-four".