20766212555 has 32 divisors (see below), whose sum is σ = 29776559040. Its totient is φ = 13724139520.

The previous prime is 20766212531. The next prime is 20766212563. The reversal of 20766212555 is 55521266702.

It is not a de Polignac number, because 20766212555 - 2⁶ = 20766212491 is a prime.

It is an unprimeable number.

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, 355814 + ... + 410043.

It is an arithmetic number, because the mean of its divisors is an integer number (930517470).

Almost surely, 2^20766212555 is an apocalyptic number.

20766212555 is a deficient number, since it is larger than the sum of its proper divisors (9010346485).

20766212555 is a wasteful number, since it uses less digits than its factorization.

20766212555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765919.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20766212555 in words is "twenty billion, seven hundred sixty-six million, two hundred twelve thousand, five hundred fifty-five".