20688463 has 2 divisors, whose sum is σ = 20688464. Its totient is φ = 20688462.

The previous prime is 20688433. The next prime is 20688517. The reversal of 20688463 is 36488602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20688463 - 2⁹ = 20687951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20688433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344231 + 10344232.

It is an arithmetic number, because the mean of its divisors is an integer number (10344232).

Almost surely, 2^20688463 is an apocalyptic number.

20688463 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688463 is an equidigital number, since it uses as much as digits as its factorization.

20688463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20688463 is about 4548.4572109673. The cubic root of 20688463 is about 274.5213182249.

The spelling of 20688463 in words is "twenty million, six hundred eighty-eight thousand, four hundred sixty-three".