20270940 has 48 divisors (see below), whose sum is σ = 57214080. Its totient is φ = 5362240.

The previous prime is 20270911. The next prime is 20270947. The reversal of 20270940 is 4907202.

It is a super-2 number, since 2×20270940² = 821822016967200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20270940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20270947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6571 + ... + 9149.

It is an arithmetic number, because the mean of its divisors is an integer number (1191960).

Almost surely, 2^20270940 is an apocalyptic number.

20270940 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 20270940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28607040).

20270940 is an abundant number, since it is smaller than the sum of its proper divisors (36943140).

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

20270940 is a wasteful number, since it uses less digits than its factorization.

20270940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20270940 is about 4502.3260654910. The cubic root of 20270940 is about 272.6620084237.

The spelling of 20270940 in words is "twenty million, two hundred seventy thousand, nine hundred forty".