20520106905 has 16 divisors (see below), whose sum is σ = 32834793600. Its totient is φ = 10943182848.

The previous prime is 20520106889. The next prime is 20520106973. The reversal of 20520106905 is 50960102502.

It is a happy number.

It is not a de Polignac number, because 20520106905 - 2⁴ = 20520106889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168921 + ... + 263769.

It is an arithmetic number, because the mean of its divisors is an integer number (2052174600).

Almost surely, 2^20520106905 is an apocalyptic number.

It is an amenable number.

20520106905 is a deficient number, since it is larger than the sum of its proper divisors (12314686695).

20520106905 is a wasteful number, since it uses less digits than its factorization.

20520106905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109280.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 20520106905 in words is "twenty billion, five hundred twenty million, one hundred six thousand, nine hundred five".