20720932 has 6 divisors (see below), whose sum is σ = 36261638. Its totient is φ = 10360464.

The previous prime is 20720911. The next prime is 20720951. The reversal of 20720932 is 23902702.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 7001316 = 3704^2 + 2646^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20720897 and 20720906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590113 + ... + 2590120.

Almost surely, 2^20720932 is an apocalyptic number.

It is an amenable number.

20720932 is a deficient number, since it is larger than the sum of its proper divisors (15540706).

20720932 is a wasteful number, since it uses less digits than its factorization.

20720932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180237 (or 5180235 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20720932 is about 4552.0250438678. The cubic root of 20720932 is about 274.6648567397.

The spelling of 20720932 in words is "twenty million, seven hundred twenty thousand, nine hundred thirty-two".