20577140 has 24 divisors (see below), whose sum is σ = 45754632. Its totient is φ = 7746560.

The previous prime is 20577131. The next prime is 20577229. The reversal of 20577140 is 4177502.

It can be written as a sum of positive squares in 4 ways, for example, as 1532644 + 19044496 = 1238^2 + 4364^2 .

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, 29921 + ... + 30600.

It is an arithmetic number, because the mean of its divisors is an integer number (1906443).

Almost surely, 2^20577140 is an apocalyptic number.

20577140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20577140 is an abundant number, since it is smaller than the sum of its proper divisors (25177492).

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

20577140 is a wasteful number, since it uses less digits than its factorization.

20577140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60547 (or 60545 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20577140 is about 4536.2032582326. The cubic root of 20577140 is about 274.0280398250.

The spelling of 20577140 in words is "twenty million, five hundred seventy-seven thousand, one hundred forty".