20505124 has 12 divisors (see below), whose sum is σ = 35924364. Its totient is φ = 10241024.

The previous prime is 20505103. The next prime is 20505127. The reversal of 20505124 is 42150502.

It can be written as a sum of positive squares in 2 ways, for example, as 13838400 + 6666724 = 3720^2 + 2582^2 .

It is a super-2 number, since 2×20505124² = 840920220510752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20505127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052 + ... + 6724.

It is an arithmetic number, because the mean of its divisors is an integer number (2993697).

Almost surely, 2^20505124 is an apocalyptic number.

It is an amenable number.

20505124 is a deficient number, since it is larger than the sum of its proper divisors (15419240).

20505124 is a wasteful number, since it uses less digits than its factorization.

20505124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5774 (or 5772 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20505124 is about 4528.2583848539. The cubic root of 20505124 is about 273.7079844888.

Adding to 20505124 its reverse (42150502), we get a palindrome (62655626).

The spelling of 20505124 in words is "twenty million, five hundred five thousand, one hundred twenty-four".