20770000640 has 36 divisors (see below), whose sum is σ = 49750645224. Its totient is φ = 8307999744.

The previous prime is 20770000637. The next prime is 20770000649. The reversal of 20770000640 is 4600007702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770000649) 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 3 ways as a sum of consecutive naturals, for example, 8112002 + ... + 8114561.

Almost surely, 2^20770000640 is an apocalyptic number.

20770000640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20770000640 is an abundant number, since it is smaller than the sum of its proper divisors (28980644584).

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

20770000640 is an equidigital number, since it uses as much as digits as its factorization.

20770000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16226584 (or 16226570 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The spelling of 20770000640 in words is "twenty billion, seven hundred seventy million, six hundred forty", and thus it is an aban number.