20398963 has 16 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 17602560.

The previous prime is 20398921. The next prime is 20398967. The reversal of 20398963 is 36989302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20398963 is a prime.

It is a super-2 number, since 2×20398963² = 832235382950738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20398967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53070 + ... + 53452.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^20398963 is an apocalyptic number.

20398963 is a deficient number, since it is larger than the sum of its proper divisors (3018893).

20398963 is a wasteful number, since it uses less digits than its factorization.

20398963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20398963 is about 4516.5211169660. The cubic root of 20398963 is about 273.2348116405.

The spelling of 20398963 in words is "twenty million, three hundred ninety-eight thousand, nine hundred sixty-three".