20481497 has 2 divisors, whose sum is σ = 20481498. Its totient is φ = 20481496.

The previous prime is 20481491. The next prime is 20481533. The reversal of 20481497 is 79418402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17172736 + 3308761 = 4144^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 20481497 - 2¹⁴ = 20465113 is a prime.

It is a super-2 number, since 2×20481497² = 838983438722018, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20481491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240748 + 10240749.

It is an arithmetic number, because the mean of its divisors is an integer number (10240749).

Almost surely, 2^20481497 is an apocalyptic number.

It is an amenable number.

20481497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20481497 is an equidigital number, since it uses as much as digits as its factorization.

20481497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20481497 is about 4525.6487932671. The cubic root of 20481497 is about 273.6028175402.

Adding to 20481497 its reverse (79418402), we get a palindrome (99899899).

The spelling of 20481497 in words is "twenty million, four hundred eighty-one thousand, four hundred ninety-seven".