20145980 has 12 divisors (see below), whose sum is σ = 42306600. Its totient is φ = 8058384.

The previous prime is 20145971. The next prime is 20145991. The reversal of 20145980 is 8954102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503630 + ... + 503669.

It is an arithmetic number, because the mean of its divisors is an integer number (3525550).

Almost surely, 2^20145980 is an apocalyptic number.

20145980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145980 is an abundant number, since it is smaller than the sum of its proper divisors (22160620).

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

20145980 is a wasteful number, since it uses less digits than its factorization.

20145980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007308 (or 1007306 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20145980 is about 4488.4273415084. The cubic root of 20145980 is about 272.1005791531.

The spelling of 20145980 in words is "twenty million, one hundred forty-five thousand, nine hundred eighty".