20545129 has 16 divisors (see below), whose sum is σ = 23901696. Its totient is φ = 17452800.

The previous prime is 20545127. The next prime is 20545153. The reversal of 20545129 is 92154502.

It is a cyclic number.

It is not a de Polignac number, because 20545129 - 2¹ = 20545127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20545097 and 20545106.

It is not an unprimeable number, because it can be changed into a prime (20545127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33544 + ... + 34150.

It is an arithmetic number, because the mean of its divisors is an integer number (1493856).

Almost surely, 2^20545129 is an apocalyptic number.

It is an amenable number.

20545129 is a deficient number, since it is larger than the sum of its proper divisors (3356567).

20545129 is a wasteful number, since it uses less digits than its factorization.

20545129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 20545129 is about 4532.6734936459. The cubic root of 20545129 is about 273.8858680716.

The spelling of 20545129 in words is "twenty million, five hundred forty-five thousand, one hundred twenty-nine".