20253940 has 24 divisors (see below), whose sum is σ = 48609792. Its totient is φ = 6944160.

The previous prime is 20253931. The next prime is 20253949. The reversal of 20253940 is 4935202.

20253940 = 1155² + 1156² + ... + 1169².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20253931) and next prime (20253949).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20253949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72196 + ... + 72475.

It is an arithmetic number, because the mean of its divisors is an integer number (2025408).

Almost surely, 2^20253940 is an apocalyptic number.

20253940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20253940 is an abundant number, since it is smaller than the sum of its proper divisors (28355852).

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

20253940 is a wasteful number, since it uses less digits than its factorization.

20253940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144687 (or 144685 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20253940 is about 4500.4377564855. The cubic root of 20253940 is about 272.5857654454.

The spelling of 20253940 in words is "twenty million, two hundred fifty-three thousand, nine hundred forty".