20983830 has 32 divisors (see below), whose sum is σ = 57556224. Its totient is φ = 4796256.

The previous prime is 20983799. The next prime is 20983891. The reversal of 20983830 is 3838902.

20983830 = T₁₉₆ + T₁₉₇ + ... + T₅₁₀.

It is a super-2 number, since 2×20983830² = 880642242937800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20983791 and 20983800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49752 + ... + 50171.

It is an arithmetic number, because the mean of its divisors is an integer number (1798632).

Almost surely, 2^20983830 is an apocalyptic number.

20983830 is an abundant number, since it is smaller than the sum of its proper divisors (36572394).

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

20983830 is a wasteful number, since it uses less digits than its factorization.

20983830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99940.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20983830 is about 4580.8110635563. The cubic root of 20983830 is about 275.8215870680.

The spelling of 20983830 in words is "twenty million, nine hundred eighty-three thousand, eight hundred thirty".