26021840 has 80 divisors (see below), whose sum is σ = 65995776. Its totient is φ = 9484800.

The previous prime is 26021833. The next prime is 26021851. The reversal of 26021840 is 4812062.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136145 + ... + 136335.

Almost surely, 2^26021840 is an apocalyptic number.

26021840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26021840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997888).

26021840 is an abundant number, since it is smaller than the sum of its proper divisors (39973936).

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

26021840 is a wasteful number, since it uses less digits than its factorization.

26021840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 26021840 is about 5101.1606522438. The cubic root of 26021840 is about 296.3325335155.

The spelling of 26021840 in words is "twenty-six million, twenty-one thousand, eight hundred forty".