20100551 has 8 divisors (see below), whose sum is σ = 21073920. Its totient is φ = 19135512.

The previous prime is 20100541. The next prime is 20100557. The reversal of 20100551 is 15500102.

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 20100551 - 2¹⁴ = 20084167 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 (20100557) 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, 3170 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (2634240).

Almost surely, 2^20100551 is an apocalyptic number.

20100551 is a deficient number, since it is larger than the sum of its proper divisors (973369).

20100551 is a wasteful number, since it uses less digits than its factorization.

20100551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 20100551 is about 4483.3638041096. The cubic root of 20100551 is about 271.8958971210.

Adding to 20100551 its reverse (15500102), we get a palindrome (35600653).

The spelling of 20100551 in words is "twenty million, one hundred thousand, five hundred fifty-one".