20730071628 has 72 divisors (see below), whose sum is σ = 61818731520. Its totient is φ = 5731814880.

The previous prime is 20730071573. The next prime is 20730071629. The reversal of 20730071628 is 82617003702.

20730071628 is a `hidden beast` number, since 20 + 7 + 3 + 0 + 0 + 7 + 1 + 628 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20730071592 and 20730071601.

It is not an unprimeable number, because it can be changed into a prime (20730071629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1318998 + ... + 1334621.

Almost surely, 2^20730071628 is an apocalyptic number.

20730071628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20730071628 is an abundant number, since it is smaller than the sum of its proper divisors (41088659892).

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

20730071628 is a wasteful number, since it uses less digits than its factorization.

20730071628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653667 (or 2653662 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 20730071628 in words is "twenty billion, seven hundred thirty million, seventy-one thousand, six hundred twenty-eight".