20551641 has 8 divisors (see below), whose sum is σ = 29893344. Its totient is φ = 12455520.

The previous prime is 20551637. The next prime is 20551697. The reversal of 20551641 is 14615502.

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

It is not a de Polignac number, because 20551641 - 2² = 20551637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20551621) 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, 311356 + ... + 311421.

It is an arithmetic number, because the mean of its divisors is an integer number (3736668).

Almost surely, 2^20551641 is an apocalyptic number.

It is an amenable number.

20551641 is a deficient number, since it is larger than the sum of its proper divisors (9341703).

20551641 is a wasteful number, since it uses less digits than its factorization.

20551641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622791.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20551641 is about 4533.3917765841. The cubic root of 20551641 is about 273.9148020405.

The spelling of 20551641 in words is "twenty million, five hundred fifty-one thousand, six hundred forty-one".