20279053728 has 108 divisors (see below), whose sum is σ = 59884157970. Its totient is φ = 6759614592.

The previous prime is 20279053727. The next prime is 20279053733. The reversal of 20279053728 is 82735097202.

20279053728 is a `hidden beast` number, since 2 + 0 + 2 + 7 + 90 + 537 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20047161744 + 231891984 = 141588^2 + 15228^2 .

It is a tau number, because it is divible by the number of its divisors (108).

It is a super-2 number, since 2×20279053728² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20279053727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 161658 + ... + 258246.

Almost surely, 2^20279053728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20279053728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29942078985).

20279053728 is an abundant number, since it is smaller than the sum of its proper divisors (39605104242).

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

20279053728 is an frugal number, since it uses more digits than its factorization.

20279053728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96623 (or 96594 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 20279053728 in words is "twenty billion, two hundred seventy-nine million, fifty-three thousand, seven hundred twenty-eight".