20694740 has 48 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 7447680.

The previous prime is 20694731. The next prime is 20694749. The reversal of 20694740 is 4749602.

It is an interprime number because it is at equal distance from previous prime (20694731) and next prime (20694749).

It is a junction number, because it is equal to n+sod(n) for n = 20694697 and 20694706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20694749) 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, 23549 + ... + 24411.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^20694740 is an apocalyptic number.

20694740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20694740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

20694740 is an abundant number, since it is smaller than the sum of its proper divisors (27205420).

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

20694740 is a wasteful number, since it uses less digits than its factorization.

20694740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20694740 is about 4549.1471728226. The cubic root of 20694740 is about 274.5490792057.

The spelling of 20694740 in words is "twenty million, six hundred ninety-four thousand, seven hundred forty".