20506212720 has 200 divisors, whose sum is σ = 81395739744. Its totient is φ = 4687123968.

The previous prime is 20506212703. The next prime is 20506212739. The reversal of 20506212720 is 2721260502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 180679 + ... + 271398.

Almost surely, 2^20506212720 is an apocalyptic number.

20506212720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20506212720 is an abundant number, since it is smaller than the sum of its proper divisors (60889527024).

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

20506212720 is a wasteful number, since it uses less digits than its factorization.

20506212720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452109 (or 452094 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The spelling of 20506212720 in words is "twenty billion, five hundred six million, two hundred twelve thousand, seven hundred twenty".