2102405720 has 16 divisors (see below), whose sum is σ = 4730412960. Its totient is φ = 840962272.

The previous prime is 2102405677. The next prime is 2102405729. The reversal of 2102405720 is 275042012.

It is a happy number.

It is a super-2 number, since 2×2102405720² = 8840219622977436800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102405729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26280032 + ... + 26280111.

It is an arithmetic number, because the mean of its divisors is an integer number (295650810).

Almost surely, 2^2102405720 is an apocalyptic number.

2102405720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102405720 is an abundant number, since it is smaller than the sum of its proper divisors (2628007240).

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

2102405720 is a wasteful number, since it uses less digits than its factorization.

2102405720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52560154 (or 52560150 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 2102405720 is about 45851.9979935444. The cubic root of 2102405720 is about 1281.0679807421.

Adding to 2102405720 its reverse (275042012), we get a palindrome (2377447732).

The spelling of 2102405720 in words is "two billion, one hundred two million, four hundred five thousand, seven hundred twenty".