20828042880 has 64 divisors (see below), whose sum is σ = 66389392800. Its totient is φ = 5554144256.

The previous prime is 20828042867. The next prime is 20828042887. The reversal of 20828042880 is 8824082802.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×20828042880² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20828042887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5422050 + ... + 5425889.

Almost surely, 2^20828042880 is an apocalyptic number.

20828042880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20828042880 is an abundant number, since it is smaller than the sum of its proper divisors (45561349920).

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

20828042880 is a wasteful number, since it uses less digits than its factorization.

20828042880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10847961 (or 10847949 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 42.

The spelling of 20828042880 in words is "twenty billion, eight hundred twenty-eight million, forty-two thousand, eight hundred eighty".