20278023 has 4 divisors (see below), whose sum is σ = 27037368. Its totient is φ = 13518680.

The previous prime is 20278021. The next prime is 20278031. The reversal of 20278023 is 32087202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20278023 - 2¹ = 20278021 is a prime.

It is a super-2 number, since 2×20278023² = 822396433577058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20277984 and 20278002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278021) 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 3 ways as a sum of consecutive naturals, for example, 3379668 + ... + 3379673.

It is an arithmetic number, because the mean of its divisors is an integer number (6759342).

Almost surely, 2^20278023 is an apocalyptic number.

20278023 is a deficient number, since it is larger than the sum of its proper divisors (6759345).

20278023 is an equidigital number, since it uses as much as digits as its factorization.

20278023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759344.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20278023 is about 4503.1125901980. The cubic root of 20278023 is about 272.6937622564.

The spelling of 20278023 in words is "twenty million, two hundred seventy-eight thousand, twenty-three".