20905536 has 28 divisors (see below), whose sum is σ = 55313072. Its totient is φ = 6968448.

The previous prime is 20905519. The next prime is 20905559. The reversal of 20905536 is 63550902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54250 + ... + 54633.

Almost surely, 2^20905536 is an apocalyptic number.

It is an amenable number.

20905536 is an abundant number, since it is smaller than the sum of its proper divisors (34407536).

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

20905536 is a wasteful number, since it uses less digits than its factorization.

20905536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108898 (or 108888 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20905536 is about 4572.2572106127. The cubic root of 20905536 is about 275.4781148246.

It can be divided in two parts, 2090 and 5536, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 20905536 in words is "twenty million, nine hundred five thousand, five hundred thirty-six".