16720520934 has 16 divisors (see below), whose sum is σ = 36013429872. Its totient is φ = 5144775648.

The previous prime is 16720520911. The next prime is 16720520983. The reversal of 16720520934 is 43902502761.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16720520892 and 16720520901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107182749 + ... + 107182904.

It is an arithmetic number, because the mean of its divisors is an integer number (2250839367).

Almost surely, 2^16720520934 is an apocalyptic number.

16720520934 is an abundant number, since it is smaller than the sum of its proper divisors (19292908938).

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

16720520934 is a wasteful number, since it uses less digits than its factorization.

16720520934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214365671.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 16720520934 in words is "sixteen billion, seven hundred twenty million, five hundred twenty thousand, nine hundred thirty-four".