205157740 has 48 divisors (see below), whose sum is σ = 442255968. Its totient is φ = 79916544.

The previous prime is 205157731. The next prime is 205157749. The reversal of 205157740 is 47751502.

It is an interprime number because it is at equal distance from previous prime (205157731) and next prime (205157749).

It is not an unprimeable number, because it can be changed into a prime (205157749) 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, 120334 + ... + 122026.

It is an arithmetic number, because the mean of its divisors is an integer number (9213666).

Almost surely, 2^205157740 is an apocalyptic number.

205157740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205157740 is an abundant number, since it is smaller than the sum of its proper divisors (237098228).

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

205157740 is a wasteful number, since it uses less digits than its factorization.

205157740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 205157740 is about 14323.3285237755. The cubic root of 205157740 is about 589.7880498861.

The spelling of 205157740 in words is "two hundred five million, one hundred fifty-seven thousand, seven hundred forty".