20205205154 has 16 divisors (see below), whose sum is σ = 30959774208. Its totient is φ = 9885379392.

The previous prime is 20205205147. The next prime is 20205205159. The reversal of 20205205154 is 45150250202.

It is not an unprimeable number, because it can be changed into a prime (20205205159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430487 + ... + 475109.

It is an arithmetic number, because the mean of its divisors is an integer number (1934985888).

Almost surely, 2^20205205154 is an apocalyptic number.

20205205154 is a deficient number, since it is larger than the sum of its proper divisors (10754569054).

20205205154 is a wasteful number, since it uses less digits than its factorization.

20205205154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49489.

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 20205205154 its reverse (45150250202), we get a palindrome (65355455356).

The spelling of 20205205154 in words is "twenty billion, two hundred five million, two hundred five thousand, one hundred fifty-four".