20732137 has 4 divisors (see below), whose sum is σ = 20823696. Its totient is φ = 20640580.

The previous prime is 20732119. The next prime is 20732141. The reversal of 20732137 is 73123702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73123702 = 2 ⋅36561851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20732137 is a prime.

It is a super-3 number, since 3×20732137³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20732737) 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 3 ways as a sum of consecutive naturals, for example, 45439 + ... + 45892.

It is an arithmetic number, because the mean of its divisors is an integer number (5205924).

Almost surely, 2^20732137 is an apocalyptic number.

It is an amenable number.

20732137 is a deficient number, since it is larger than the sum of its proper divisors (91559).

20732137 is an equidigital number, since it uses as much as digits as its factorization.

20732137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91558.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 20732137 is about 4553.2556484344. The cubic root of 20732137 is about 274.7143568480.

Adding to 20732137 its reverse (73123702), we get a palindrome (93855839).

The spelling of 20732137 in words is "twenty million, seven hundred thirty-two thousand, one hundred thirty-seven".