205394631 has 16 divisors (see below), whose sum is σ = 295317120. Its totient is φ = 126228960.

The previous prime is 205394621. The next prime is 205394633. The reversal of 205394631 is 136493502.

205394631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205394631 - 2⁵ = 205394599 is a prime.

It is a super-2 number, since 2×205394631² = 84373908887252322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205394592 and 205394601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205394633) 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, 30436 + ... + 36566.

It is an arithmetic number, because the mean of its divisors is an integer number (18457320).

Almost surely, 2^205394631 is an apocalyptic number.

205394631 is a deficient number, since it is larger than the sum of its proper divisors (89922489).

205394631 is a wasteful number, since it uses less digits than its factorization.

205394631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 205394631 is about 14331.5955496937. The cubic root of 205394631 is about 590.0149675414.

The spelling of 205394631 in words is "two hundred five million, three hundred ninety-four thousand, six hundred thirty-one".