20347934 has 4 divisors (see below), whose sum is σ = 30521904. Its totient is φ = 10173966.

The previous prime is 20347909. The next prime is 20347973. The reversal of 20347934 is 43974302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43974302 = 2 ⋅21987151.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20347934.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086982 + ... + 5086985.

It is an arithmetic number, because the mean of its divisors is an integer number (7630476).

Almost surely, 2^20347934 is an apocalyptic number.

20347934 is a deficient number, since it is larger than the sum of its proper divisors (10173970).

20347934 is a wasteful number, since it uses less digits than its factorization.

20347934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10173969.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20347934 is about 4510.8684308013. The cubic root of 20347934 is about 273.0067846623.

The spelling of 20347934 in words is "twenty million, three hundred forty-seven thousand, nine hundred thirty-four".