20265440 has 48 divisors (see below), whose sum is σ = 51565248. Its totient is φ = 7481856.

The previous prime is 20265433. The next prime is 20265467. The reversal of 20265440 is 4456202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792 + ... + 6951.

It is an arithmetic number, because the mean of its divisors is an integer number (1074276).

Almost surely, 2^20265440 is an apocalyptic number.

20265440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20265440 is an abundant number, since it is smaller than the sum of its proper divisors (31299808).

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

20265440 is a wasteful number, since it uses less digits than its factorization.

20265440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9771 (or 9763 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20265440 is about 4501.7152286656. The cubic root of 20265440 is about 272.6373462440.

The spelling of 20265440 in words is "twenty million, two hundred sixty-five thousand, four hundred forty".