20206954656 has 144 divisors (see below), whose sum is σ = 68105104704. Its totient is φ = 5773400064.

The previous prime is 20206954643. The next prime is 20206954679. The reversal of 20206954656 is 65645960202.

It is a happy number.

20206954656 is a `hidden beast` number, since 20 + 20 + 69 + 546 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131185 + ... + 240048.

It is an arithmetic number, because the mean of its divisors is an integer number (472952116).

Almost surely, 2^20206954656 is an apocalyptic number.

It is an amenable number.

20206954656 is an abundant number, since it is smaller than the sum of its proper divisors (47898150048).

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

20206954656 is an equidigital number, since it uses as much as digits as its factorization.

20206954656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371265 (or 371245 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 20206954656 in words is "twenty billion, two hundred six million, nine hundred fifty-four thousand, six hundred fifty-six".