20577738 has 32 divisors (see below), whose sum is σ = 42739200. Its totient is φ = 6598080.

The previous prime is 20577737. The next prime is 20577749. The reversal of 20577738 is 83777502.

It is a junction number, because it is equal to n+sod(n) for n = 20577696 and 20577705.

It is not an unprimeable number, because it can be changed into a prime (20577731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58788 + ... + 59136.

It is an arithmetic number, because the mean of its divisors is an integer number (1335600).

Almost surely, 2^20577738 is an apocalyptic number.

20577738 is an abundant number, since it is smaller than the sum of its proper divisors (22161462).

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

20577738 is a wasteful number, since it uses less digits than its factorization.

20577738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 20577738 is about 4536.2691719077. The cubic root of 20577738 is about 274.0306943432.

The spelling of 20577738 in words is "twenty million, five hundred seventy-seven thousand, seven hundred thirty-eight".