20478076072 has 8 divisors (see below), whose sum is σ = 38396392650. Its totient is φ = 10239038032.

The previous prime is 20478076043. The next prime is 20478076079. The reversal of 20478076072 is 27067087402.

It can be written as a sum of positive squares in only one way, i.e., 14965607556 + 5512468516 = 122334^2 + 74246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20478076072² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20478076079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279879747 + ... + 1279879762.

Almost surely, 2^20478076072 is an apocalyptic number.

It is an amenable number.

20478076072 is a deficient number, since it is larger than the sum of its proper divisors (17918316578).

20478076072 is a wasteful number, since it uses less digits than its factorization.

20478076072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559759515 (or 2559759511 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 43.

The spelling of 20478076072 in words is "twenty billion, four hundred seventy-eight million, seventy-six thousand, seventy-two".