202640662420 has 96 divisors (see below), whose sum is σ = 500481289728. Its totient is φ = 67463788032.

The previous prime is 202640662403. The next prime is 202640662447. The reversal of 202640662420 is 24266046202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2566654 + ... + 2644426.

It is an arithmetic number, because the mean of its divisors is an integer number (5213346768).

Almost surely, 2^202640662420 is an apocalyptic number.

202640662420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202640662420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250240644864).

202640662420 is an abundant number, since it is smaller than the sum of its proper divisors (297840627308).

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

202640662420 is a wasteful number, since it uses less digits than its factorization.

202640662420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78329 (or 78327 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 202640662420 in words is "two hundred two billion, six hundred forty million, six hundred sixty-two thousand, four hundred twenty".