20555951 has 8 divisors (see below), whose sum is σ = 23100000. Its totient is φ = 18149472.

The previous prime is 20555947. The next prime is 20555957. The reversal of 20555951 is 15955502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20555951 - 2² = 20555947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34076 + ... + 34673.

It is an arithmetic number, because the mean of its divisors is an integer number (2887500).

Almost surely, 2^20555951 is an apocalyptic number.

20555951 is a deficient number, since it is larger than the sum of its proper divisors (2544049).

20555951 is a wasteful number, since it uses less digits than its factorization.

20555951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68785.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 20555951 is about 4533.8671131827. The cubic root of 20555951 is about 273.9339487723.

The spelling of 20555951 in words is "twenty million, five hundred fifty-five thousand, nine hundred fifty-one".