20516126 has 4 divisors (see below), whose sum is σ = 30774192. Its totient is φ = 10258062.

The previous prime is 20516123. The next prime is 20516147. The reversal of 20516126 is 62161502.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20516126² = 841822852095752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5129030 + ... + 5129033.

It is an arithmetic number, because the mean of its divisors is an integer number (7693548).

Almost surely, 2^20516126 is an apocalyptic number.

20516126 is a deficient number, since it is larger than the sum of its proper divisors (10258066).

20516126 is a wasteful number, since it uses less digits than its factorization.

20516126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10258065.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20516126 is about 4529.4730377827. The cubic root of 20516126 is about 273.7569283013.

Adding to 20516126 its reverse (62161502), we get a palindrome (82677628).

The spelling of 20516126 in words is "twenty million, five hundred sixteen thousand, one hundred twenty-six".