20577401 has 4 divisors (see below), whose sum is σ = 22160292. Its totient is φ = 18994512.

The previous prime is 20577379. The next prime is 20577419. The reversal of 20577401 is 10477502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1428025 + 19149376 = 1195^2 + 4376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20577401 - 2¹⁰ = 20576377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20577461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791426 + ... + 791451.

It is an arithmetic number, because the mean of its divisors is an integer number (5540073).

Almost surely, 2^20577401 is an apocalyptic number.

It is an amenable number.

20577401 is a deficient number, since it is larger than the sum of its proper divisors (1582891).

20577401 is a wasteful number, since it uses less digits than its factorization.

20577401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582890.

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

The square root of 20577401 is about 4536.2320266935. The cubic root of 20577401 is about 274.0291984086.

The spelling of 20577401 in words is "twenty million, five hundred seventy-seven thousand, four hundred one".