20516023400 has 24 divisors (see below), whose sum is σ = 47699754870. Its totient is φ = 8206409280.

The previous prime is 20516023399. The next prime is 20516023519. The reversal of 20516023400 is 432061502.

It can be written as a sum of positive squares in 3 ways, for example, as 14809429636 + 5706593764 = 121694^2 + 75542^2 .

It is a super-2 number, since 2×20516023400² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51289859 + ... + 51290258.

Almost surely, 2^20516023400 is an apocalyptic number.

20516023400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20516023400 is an abundant number, since it is smaller than the sum of its proper divisors (27183731470).

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

20516023400 is a wasteful number, since it uses less digits than its factorization.

20516023400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102580133 (or 102580124 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20516023400 its reverse (432061502), we get a palindrome (20948084902).

The spelling of 20516023400 in words is "twenty billion, five hundred sixteen million, twenty-three thousand, four hundred".