205720146 has 12 divisors (see below), whose sum is σ = 445727022. Its totient is φ = 68573376.

The previous prime is 205720117. The next prime is 205720183. The reversal of 205720146 is 641027502.

It can be written as a sum of positive squares in only one way, i.e., 171321921 + 34398225 = 13089^2 + 5865^2 .

It is a super-2 number, since 2×205720146² = 84641556940522632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5714431 + ... + 5714466.

Almost surely, 2^205720146 is an apocalyptic number.

205720146 is an abundant number, since it is smaller than the sum of its proper divisors (240006876).

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

205720146 is a wasteful number, since it uses less digits than its factorization.

205720146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11428905 (or 11428902 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 205720146 is about 14342.9476050078. The cubic root of 205720146 is about 590.3264936193.

Adding to 205720146 its reverse (641027502), we get a palindrome (846747648).

The spelling of 205720146 in words is "two hundred five million, seven hundred twenty thousand, one hundred forty-six".