20521134 has 32 divisors (see below), whose sum is σ = 45793440. Its totient is φ = 6811776.

The previous prime is 20521099. The next prime is 20521147. The reversal of 20521134 is 43112502.

It is a super-2 number, since 2×20521134² = 842233881291912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15174 + ... + 16470.

It is an arithmetic number, because the mean of its divisors is an integer number (1431045).

Almost surely, 2^20521134 is an apocalyptic number.

20521134 is an abundant number, since it is smaller than the sum of its proper divisors (25272306).

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

20521134 is a wasteful number, since it uses less digits than its factorization.

20521134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20521134 is about 4530.0258277409. The cubic root of 20521134 is about 273.7792012385.

Adding to 20521134 its reverse (43112502), we get a palindrome (63633636).

The spelling of 20521134 in words is "twenty million, five hundred twenty-one thousand, one hundred thirty-four".