20521124 has 12 divisors (see below), whose sum is σ = 38674524. Its totient is φ = 9471264.

The previous prime is 20521099. The next prime is 20521147. The reversal of 20521124 is 42112502.

It can be written as a sum of positive squares in 2 ways, for example, as 9498724 + 11022400 = 3082^2 + 3320^2 .

It is a super-2 number, since 2×20521124² = 842233060446752, which contains 22 as substring.

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, 197267 + ... + 197370.

It is an arithmetic number, because the mean of its divisors is an integer number (3222877).

Almost surely, 2^20521124 is an apocalyptic number.

It is an amenable number.

20521124 is a deficient number, since it is larger than the sum of its proper divisors (18153400).

20521124 is a wasteful number, since it uses less digits than its factorization.

20521124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394654 (or 394652 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20521124 is about 4530.0247239943. The cubic root of 20521124 is about 273.7791567674.

Adding to 20521124 its reverse (42112502), we get a palindrome (62633626).

The spelling of 20521124 in words is "twenty million, five hundred twenty-one thousand, one hundred twenty-four".