20545216670 has 64 divisors (see below), whose sum is σ = 42200040960. Its totient is φ = 7128739200.

The previous prime is 20545216661. The next prime is 20545216709. The reversal of 20545216670 is 7661254502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050380 + ... + 1069760.

It is an arithmetic number, because the mean of its divisors is an integer number (659375640).

Almost surely, 2^20545216670 is an apocalyptic number.

20545216670 is an abundant number, since it is smaller than the sum of its proper divisors (21654824290).

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

20545216670 is a wasteful number, since it uses less digits than its factorization.

20545216670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19841.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 20545216670 in words is "twenty billion, five hundred forty-five million, two hundred sixteen thousand, six hundred seventy".