11720820 has 48 divisors (see below), whose sum is σ = 34751808. Its totient is φ = 2941440.

The previous prime is 11720809. The next prime is 11720851. The reversal of 11720820 is 2802711.

11720820 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4726 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (723996).

Almost surely, 2^11720820 is an apocalyptic number.

11720820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11720820 is an abundant number, since it is smaller than the sum of its proper divisors (23030988).

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

11720820 is a wasteful number, since it uses less digits than its factorization.

11720820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520 (or 11518 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 11720820 is about 3423.5683139087. The cubic root of 11720820 is about 227.1534473242.

The spelling of 11720820 in words is "eleven million, seven hundred twenty thousand, eight hundred twenty".