20278963 has 4 divisors (see below), whose sum is σ = 20290248. Its totient is φ = 20267680.

The previous prime is 20278933. The next prime is 20278967. The reversal of 20278963 is 36987202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20278963 - 2¹⁷ = 20147891 is a prime.

It is a super-2 number, since 2×20278963² = 822472680710738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20278967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (5072562).

Almost surely, 2^20278963 is an apocalyptic number.

20278963 is a deficient number, since it is larger than the sum of its proper divisors (11285).

20278963 is an equidigital number, since it uses as much as digits as its factorization.

20278963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11284.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20278963 is about 4503.2169612400. The cubic root of 20278963 is about 272.6979758193.

The spelling of 20278963 in words is "twenty million, two hundred seventy-eight thousand, nine hundred sixty-three".