20257140 has 48 divisors (see below), whose sum is σ = 56968128. Its totient is φ = 5378304.

The previous prime is 20257121. The next prime is 20257163. The reversal of 20257140 is 4175202.

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, 16384 + ... + 17576.

It is an arithmetic number, because the mean of its divisors is an integer number (1186836).

Almost surely, 2^20257140 is an apocalyptic number.

20257140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20257140 is an abundant number, since it is smaller than the sum of its proper divisors (36710988).

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

20257140 is a wasteful number, since it uses less digits than its factorization.

20257140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1486 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20257140 is about 4500.7932634148. The cubic root of 20257140 is about 272.6001203235.

The spelling of 20257140 in words is "twenty million, two hundred fifty-seven thousand, one hundred forty".