20343978 has 24 divisors (see below), whose sum is σ = 44487300. Its totient is φ = 6718464.

The previous prime is 20343977. The next prime is 20343979. The reversal of 20343978 is 87934302.

It is an interprime number because it is at equal distance from previous prime (20343977) and next prime (20343979).

It can be written as a sum of positive squares in 2 ways, for example, as 19740249 + 603729 = 4443^2 + 777^2 .

It is not an unprimeable number, because it can be changed into a prime (20343971) 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 11 ways as a sum of consecutive naturals, for example, 3223 + ... + 7146.

Almost surely, 2^20343978 is an apocalyptic number.

20343978 is an abundant number, since it is smaller than the sum of its proper divisors (24143322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20343978 is a wasteful number, since it uses less digits than its factorization.

20343978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10486 (or 10483 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20343978 is about 4510.4299129906. The cubic root of 20343978 is about 272.9890910587.

It can be divided in two parts, 20343 and 978, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20343978 in words is "twenty million, three hundred forty-three thousand, nine hundred seventy-eight".