26643920 has 20 divisors (see below), whose sum is σ = 61947300. Its totient is φ = 10657536.

The previous prime is 26643917. The next prime is 26643923. The reversal of 26643920 is 2934662.

It is an interprime number because it is at equal distance from previous prime (26643917) and next prime (26643923).

It can be written as a sum of positive squares in 2 ways, for example, as 7529536 + 19114384 = 2744^2 + 4372^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26643923) 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, 166445 + ... + 166604.

It is an arithmetic number, because the mean of its divisors is an integer number (3097365).

Almost surely, 2^26643920 is an apocalyptic number.

26643920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26643920 is an abundant number, since it is smaller than the sum of its proper divisors (35303380).

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

26643920 is a wasteful number, since it uses less digits than its factorization.

26643920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333062 (or 333056 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 26643920 is about 5161.7748885437. The cubic root of 26643920 is about 298.6753447556.

The spelling of 26643920 in words is "twenty-six million, six hundred forty-three thousand, nine hundred twenty".