20481137 has 8 divisors (see below), whose sum is σ = 20784480. Its totient is φ = 20180160.

The previous prime is 20481079. The next prime is 20481193. The reversal of 20481137 is 73118402.

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 20481137 - 2¹⁸ = 20218993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20481037) 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, 23414 + ... + 24272.

It is an arithmetic number, because the mean of its divisors is an integer number (2598060).

Almost surely, 2^20481137 is an apocalyptic number.

It is an amenable number.

20481137 is a deficient number, since it is larger than the sum of its proper divisors (303343).

20481137 is a wasteful number, since it uses less digits than its factorization.

20481137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20481137 is about 4525.6090197895. The cubic root of 20481137 is about 273.6012145065.

Adding to 20481137 its reverse (73118402), we get a palindrome (93599539).

The spelling of 20481137 in words is "twenty million, four hundred eighty-one thousand, one hundred thirty-seven".