20280763 has 2 divisors, whose sum is σ = 20280764. Its totient is φ = 20280762.

The previous prime is 20280761. The next prime is 20280781. The reversal of 20280763 is 36708202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20280763 - 2¹ = 20280761 is a prime.

It is a super-2 number, since 2×20280763² = 822618695724338, which contains 22 as substring.

Together with 20280761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20280761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140381 + 10140382.

It is an arithmetic number, because the mean of its divisors is an integer number (10140382).

Almost surely, 2^20280763 is an apocalyptic number.

20280763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280763 is an equidigital number, since it uses as much as digits as its factorization.

20280763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20280763 is about 4503.4168139314. The cubic root of 20280763 is about 272.7060439806.

Adding to 20280763 its reverse (36708202), we get a palindrome (56988965).

The spelling of 20280763 in words is "twenty million, two hundred eighty thousand, seven hundred sixty-three".