20863604 has 6 divisors (see below), whose sum is σ = 36511314. Its totient is φ = 10431800.

The previous prime is 20863603. The next prime is 20863613. The reversal of 20863604 is 40636802.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 252004 = 4540^2 + 502^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20863603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2607947 + ... + 2607954.

It is an arithmetic number, because the mean of its divisors is an integer number (6085219).

Almost surely, 2^20863604 is an apocalyptic number.

It is an amenable number.

20863604 is a deficient number, since it is larger than the sum of its proper divisors (15647710).

20863604 is a wasteful number, since it uses less digits than its factorization.

20863604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5215905 (or 5215903 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20863604 is about 4567.6694276184. The cubic root of 20863604 is about 275.2938082993.

The spelling of 20863604 in words is "twenty million, eight hundred sixty-three thousand, six hundred four".