20640000620 has 12 divisors (see below), whose sum is σ = 43344001344. Its totient is φ = 8256000240.

The previous prime is 20640000617. The next prime is 20640000683. The reversal of 20640000620 is 2600004602.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1032000031 = 20640000620 / (2 + 0 + 6 + 4 + 0 + 0 + 0 + 0 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 20640000592 and 20640000601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515999996 + ... + 516000035.

It is an arithmetic number, because the mean of its divisors is an integer number (3612000112).

Almost surely, 2^20640000620 is an apocalyptic number.

20640000620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640000620 is an abundant number, since it is smaller than the sum of its proper divisors (22704000724).

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

20640000620 is a wasteful number, since it uses less digits than its factorization.

20640000620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032000040 (or 1032000038 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The spelling of 20640000620 in words is "twenty billion, six hundred forty million, six hundred twenty", and thus it is an aban number.