20997734 has 4 divisors (see below), whose sum is σ = 31496604. Its totient is φ = 10498866.

The previous prime is 20997731. The next prime is 20997761. The reversal of 20997734 is 43779902.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20997691 and 20997700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5249432 + ... + 5249435.

It is an arithmetic number, because the mean of its divisors is an integer number (7874151).

Almost surely, 2^20997734 is an apocalyptic number.

20997734 is a deficient number, since it is larger than the sum of its proper divisors (10498870).

20997734 is a wasteful number, since it uses less digits than its factorization.

20997734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10498869.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20997734 is about 4582.3284474162. The cubic root of 20997734 is about 275.8824939126.

The spelling of 20997734 in words is "twenty million, nine hundred ninety-seven thousand, seven hundred thirty-four".