11720731 has 8 divisors (see below), whose sum is σ = 13342464. Its totient is φ = 10191720.

The previous prime is 11720707. The next prime is 11720767. The reversal of 11720731 is 13702711.

11720731 = T₁₆₉ + T₁₇₀ + ... + T₄₂₁.

11720731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11720731 - 2⁷ = 11720603 is a prime.

It is a super-2 number, since 2×11720731² = 274751070348722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11720431) 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, 22911 + ... + 23416.

It is an arithmetic number, because the mean of its divisors is an integer number (1667808).

Almost surely, 2^11720731 is an apocalyptic number.

11720731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11720731 is a deficient number, since it is larger than the sum of its proper divisors (1621733).

11720731 is a wasteful number, since it uses less digits than its factorization.

11720731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46361.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 11720731 is about 3423.5553157500. Note that the first 3 decimals coincide. The cubic root of 11720731 is about 227.1528723727.

The spelling of 11720731 in words is "eleven million, seven hundred twenty thousand, seven hundred thirty-one".