20085980 has 24 divisors (see below), whose sum is σ = 43636320. Its totient is φ = 7757120.

The previous prime is 20085979. The next prime is 20086007. The reversal of 20085980 is 8958002.

20085980 = T₂₈₃₂ + T₂₈₃₃ + ... + T₂₈₃₆.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16736 + ... + 17895.

It is an arithmetic number, because the mean of its divisors is an integer number (1818180).

Almost surely, 2^20085980 is an apocalyptic number.

20085980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20085980 is an abundant number, since it is smaller than the sum of its proper divisors (23550340).

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

20085980 is a wasteful number, since it uses less digits than its factorization.

20085980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34669 (or 34667 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 20085980 is about 4481.7385019655. The cubic root of 20085980 is about 271.8301816287.

The spelling of 20085980 in words is "twenty million, eighty-five thousand, nine hundred eighty".