20515283 has 2 divisors, whose sum is σ = 20515284. Its totient is φ = 20515282.

The previous prime is 20515249. The next prime is 20515291. The reversal of 20515283 is 38251502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20515283 - 2¹⁰ = 20514259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20515223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257641 + 10257642.

It is an arithmetic number, because the mean of its divisors is an integer number (10257642).

Almost surely, 2^20515283 is an apocalyptic number.

20515283 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515283 is an equidigital number, since it uses as much as digits as its factorization.

20515283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20515283 is about 4529.3799796440. The cubic root of 20515283 is about 273.7531787264.

Adding to 20515283 its reverse (38251502), we get a palindrome (58766785).

The spelling of 20515283 in words is "twenty million, five hundred fifteen thousand, two hundred eighty-three".