20732551 has 8 divisors (see below), whose sum is σ = 23721984. Its totient is φ = 17750040.

The previous prime is 20732513. The next prime is 20732567. The reversal of 20732551 is 15523702.

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

It is not a de Polignac number, because 20732551 - 2¹³ = 20724359 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 (20732501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10146 + ... + 12016.

It is an arithmetic number, because the mean of its divisors is an integer number (2965248).

Almost surely, 2^20732551 is an apocalyptic number.

20732551 is a deficient number, since it is larger than the sum of its proper divisors (2989433).

20732551 is a wasteful number, since it uses less digits than its factorization.

20732551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20732551 is about 4553.3011101837. The cubic root of 20732551 is about 274.7161854260.

It can be divided in two parts, 2073 and 2551, that added together give a square (4624 = 68²).

The spelling of 20732551 in words is "twenty million, seven hundred thirty-two thousand, five hundred fifty-one".