205420157 has 8 divisors (see below), whose sum is σ = 206724672. Its totient is φ = 204120000.

The previous prime is 205420151. The next prime is 205420169. The reversal of 205420157 is 751024502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205420157 - 2⁶ = 205420093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205420151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157733 + ... + 159029.

It is an arithmetic number, because the mean of its divisors is an integer number (25840584).

Almost surely, 2^205420157 is an apocalyptic number.

It is an amenable number.

205420157 is a deficient number, since it is larger than the sum of its proper divisors (1304515).

205420157 is a wasteful number, since it uses less digits than its factorization.

205420157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 205420157 is about 14332.4860718579. The cubic root of 205420157 is about 590.0394084565.

Adding to 205420157 its reverse (751024502), we get a palindrome (956444659).

The spelling of 205420157 in words is "two hundred five million, four hundred twenty thousand, one hundred fifty-seven".