20929128921792 has 168 divisors, whose sum is σ = 73833316103456. Its totient is φ = 5519770251264.

The previous prime is 20929128921733. The next prime is 20929128921803. The reversal of 20929128921792 is 29712982192902.

20929128921792 is a `hidden beast` number, since 20 + 9 + 291 + 28 + 9 + 217 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 199592053 + ... + 199696884.

Almost surely, 2^{20929128921792} is an apocalyptic number.

It is an amenable number.

20929128921792 is an abundant number, since it is smaller than the sum of its proper divisors (52904187181664).

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

20929128921792 is a wasteful number, since it uses less digits than its factorization.

20929128921792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399288975 (or 399288962 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 20929128921792 in words is "twenty trillion, nine hundred twenty-nine billion, one hundred twenty-eight million, nine hundred twenty-one thousand, seven hundred ninety-two".