11999020 has 24 divisors (see below), whose sum is σ = 27489168. Its totient is φ = 4363200.

The previous prime is 11998979. The next prime is 11999027. The reversal of 11999020 is 2099911.

11999020 = T₄₁₁ + T₄₁₂ + ... + T₅₂₀.

It is not an unprimeable number, because it can be changed into a prime (11999027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27051 + ... + 27490.

It is an arithmetic number, because the mean of its divisors is an integer number (1145382).

Almost surely, 2^11999020 is an apocalyptic number.

11999020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11999020 is an abundant number, since it is smaller than the sum of its proper divisors (15490148).

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

11999020 is a wasteful number, since it uses less digits than its factorization.

11999020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54561 (or 54559 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 11999020 is about 3463.9601614337. The cubic root of 11999020 is about 228.9366160079.

The spelling of 11999020 in words is "eleven million, nine hundred ninety-nine thousand, twenty".