2020646640 has 40 divisors (see below), whose sum is σ = 6264005328. Its totient is φ = 538839040.

The previous prime is 2020646633. The next prime is 2020646647. The reversal of 2020646640 is 466460202.

It is an interprime number because it is at equal distance from previous prime (2020646633) and next prime (2020646647).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2020646598 and 2020646607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020646647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4209441 + ... + 4209920.

Almost surely, 2^2020646640 is an apocalyptic number.

2020646640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2020646640 is an abundant number, since it is smaller than the sum of its proper divisors (4243358688).

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

2020646640 is a wasteful number, since it uses less digits than its factorization.

2020646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8419377 (or 8419371 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 2020646640 is about 44951.6033084472. The cubic root of 2020646640 is about 1264.2417386016.

The spelling of 2020646640 in words is "two billion, twenty million, six hundred forty-six thousand, six hundred forty".