20900529 has 24 divisors (see below), whose sum is σ = 33312552. Its totient is φ = 12545280.

The previous prime is 20900527. The next prime is 20900533. The reversal of 20900529 is 92500902.

It can be written as a sum of positive squares in 4 ways, for example, as 1742400 + 19158129 = 1320^2 + 4377^2 .

It is not a de Polignac number, because 20900529 - 2¹ = 20900527 is a prime.

It is a super-2 number, since 2×20900529² = 873664224959682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2619 + ... + 6975.

It is an arithmetic number, because the mean of its divisors is an integer number (1388023).

Almost surely, 2^20900529 is an apocalyptic number.

It is an amenable number.

20900529 is a deficient number, since it is larger than the sum of its proper divisors (12412023).

20900529 is a wasteful number, since it uses less digits than its factorization.

20900529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4417 (or 4414 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20900529 is about 4571.7096364489. The cubic root of 20900529 is about 275.4561201872.

The spelling of 20900529 in words is "twenty million, nine hundred thousand, five hundred twenty-nine".