20400963 has 24 divisors (see below), whose sum is σ = 30617664. Its totient is φ = 12067440.

The previous prime is 20400959. The next prime is 20400967. The reversal of 20400963 is 36900402.

It is an interprime number because it is at equal distance from previous prime (20400959) and next prime (20400967).

It is not a de Polignac number, because 20400963 - 2² = 20400959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14956 + ... + 16262.

It is an arithmetic number, because the mean of its divisors is an integer number (1275736).

Almost surely, 2^20400963 is an apocalyptic number.

20400963 is a deficient number, since it is larger than the sum of its proper divisors (10216701).

20400963 is a wasteful number, since it uses less digits than its factorization.

20400963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20400963 is about 4516.7425208883. The cubic root of 20400963 is about 273.2437410448.

The spelling of 20400963 in words is "twenty million, four hundred thousand, nine hundred sixty-three".