205420400354 has 32 divisors (see below), whose sum is σ = 355300389360. Its totient is φ = 88229763072.

The previous prime is 205420400267. The next prime is 205420400363. The reversal of 205420400354 is 453004024502.

It can be written as a sum of positive squares in 8 ways, for example, as 105023309329 + 100397091025 = 324073^2 + 316855^2 .

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, 2571629 + ... + 2650304.

Almost surely, 2^205420400354 is an apocalyptic number.

205420400354 is a deficient number, since it is larger than the sum of its proper divisors (149879989006).

205420400354 is a wasteful number, since it uses less digits than its factorization.

205420400354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222054.

The product of its (nonzero) digits is 19200, while the sum is 29.

Adding to 205420400354 its reverse (453004024502), we get a palindrome (658424424856).

The spelling of 205420400354 in words is "two hundred five billion, four hundred twenty million, four hundred thousand, three hundred fifty-four".