20551694 has 4 divisors (see below), whose sum is σ = 30827544. Its totient is φ = 10275846.

The previous prime is 20551637. The next prime is 20551697. The reversal of 20551694 is 49615502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49615502 = 2 ⋅24807751.

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 20551694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5137922 + ... + 5137925.

It is an arithmetic number, because the mean of its divisors is an integer number (7706886).

Almost surely, 2^20551694 is an apocalyptic number.

20551694 is a deficient number, since it is larger than the sum of its proper divisors (10275850).

20551694 is a wasteful number, since it uses less digits than its factorization.

20551694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275849.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20551694 is about 4533.3976220932. The cubic root of 20551694 is about 273.9150375038.

The spelling of 20551694 in words is "twenty million, five hundred fifty-one thousand, six hundred ninety-four".