20777732 has 6 divisors (see below), whose sum is σ = 36361038. Its totient is φ = 10388864.

The previous prime is 20777707. The next prime is 20777737. The reversal of 20777732 is 23777702.

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 1976836 = 4336^2 + 1406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20777692 and 20777701.

It is not an unprimeable number, because it can be changed into a prime (20777737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2597213 + ... + 2597220.

It is an arithmetic number, because the mean of its divisors is an integer number (6060173).

Almost surely, 2^20777732 is an apocalyptic number.

It is an amenable number.

20777732 is a deficient number, since it is larger than the sum of its proper divisors (15583306).

20777732 is a wasteful number, since it uses less digits than its factorization.

20777732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194437 (or 5194435 counting only the distinct ones).

The product of its (nonzero) digits is 28812, while the sum is 35.

The square root of 20777732 is about 4558.2597556524. The cubic root of 20777732 is about 274.9155972383.

The spelling of 20777732 in words is "twenty million, seven hundred seventy-seven thousand, seven hundred thirty-two".