205156005420 has 24 divisors (see below), whose sum is σ = 574436815344. Its totient is φ = 54708268096.

The previous prime is 205156005371. The next prime is 205156005463. The reversal of 205156005420 is 24500651502.

205156005420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709633319 + ... + 1709633438.

It is an arithmetic number, because the mean of its divisors is an integer number (23934867306).

Almost surely, 2^205156005420 is an apocalyptic number.

205156005420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205156005420 is an abundant number, since it is smaller than the sum of its proper divisors (369280809924).

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

205156005420 is a wasteful number, since it uses less digits than its factorization.

205156005420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419266769 (or 3419266767 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 205156005420 its reverse (24500651502), we get a palindrome (229656656922).

The spelling of 205156005420 in words is "two hundred five billion, one hundred fifty-six million, five thousand, four hundred twenty".