20351550540 has 24 divisors (see below), whose sum is σ = 56984341680. Its totient is φ = 5427080128.

The previous prime is 20351550533. The next prime is 20351550551. The reversal of 20351550540 is 4505515302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20351550498 and 20351550507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169596195 + ... + 169596314.

It is an arithmetic number, because the mean of its divisors is an integer number (2374347570).

Almost surely, 2^20351550540 is an apocalyptic number.

20351550540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20351550540 is an abundant number, since it is smaller than the sum of its proper divisors (36632791140).

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

20351550540 is a wasteful number, since it uses less digits than its factorization.

20351550540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339192521 (or 339192519 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 20351550540 in words is "twenty billion, three hundred fifty-one million, five hundred fifty thousand, five hundred forty".