20545604 has 6 divisors (see below), whose sum is σ = 35954814. Its totient is φ = 10272800.

The previous prime is 20545597. The next prime is 20545607. The reversal of 20545604 is 40654502.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 313600 = 4498^2 + 560^2 .

It is not an unprimeable number, because it can be changed into a prime (20545607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568197 + ... + 2568204.

It is an arithmetic number, because the mean of its divisors is an integer number (5992469).

Almost surely, 2^20545604 is an apocalyptic number.

It is an amenable number.

20545604 is a deficient number, since it is larger than the sum of its proper divisors (15409210).

20545604 is a wasteful number, since it uses less digits than its factorization.

20545604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136405 (or 5136403 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20545604 is about 4532.7258906755. The cubic root of 20545604 is about 273.8879787874.

The spelling of 20545604 in words is "twenty million, five hundred forty-five thousand, six hundred four".