2100720 has 40 divisors (see below), whose sum is σ = 6512976. Its totient is φ = 560128.

The previous prime is 2100719. The next prime is 2100727. The reversal of 2100720 is 270012.

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 (12).

It is a junction number, because it is equal to n+sod(n) for n = 2100696 and 2100705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100727) 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, 4137 + ... + 4616.

2^2100720 is an apocalyptic number.

2100720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100720 is an abundant number, since it is smaller than the sum of its proper divisors (4412256).

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

2100720 is a wasteful number, since it uses less digits than its factorization.

2100720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8769 (or 8763 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 2100720 is about 1449.3860769305. The cubic root of 2100720 is about 128.0725500169.

Adding to 2100720 its reverse (270012), we get a palindrome (2370732).

The spelling of 2100720 in words is "two million, one hundred thousand, seven hundred twenty".