20500777401 has 32 divisors (see below), whose sum is σ = 30173017728. Its totient is φ = 12300802560.

The previous prime is 20500777399. The next prime is 20500777439. The reversal of 20500777401 is 10477700502.

It is a happy number.

It is not a de Polignac number, because 20500777401 - 2¹ = 20500777399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20500777441) 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 31 ways as a sum of consecutive naturals, for example, 3942135 + ... + 3947331.

It is an arithmetic number, because the mean of its divisors is an integer number (942906804).

Almost surely, 2^20500777401 is an apocalyptic number.

It is an amenable number.

20500777401 is a deficient number, since it is larger than the sum of its proper divisors (9672240327).

20500777401 is a wasteful number, since it uses less digits than its factorization.

20500777401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7721.

The product of its (nonzero) digits is 13720, while the sum is 33.

The spelling of 20500777401 in words is "twenty billion, five hundred million, seven hundred seventy-seven thousand, four hundred one".