20156316780 has 24 divisors (see below), whose sum is σ = 56437687152. Its totient is φ = 5375017792.

The previous prime is 20156316751. The next prime is 20156316787. The reversal of 20156316780 is 8761365102.

It is a super-2 number, since 2×20156316780² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20156316787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167969247 + ... + 167969366.

It is an arithmetic number, because the mean of its divisors is an integer number (2351570298).

Almost surely, 2^20156316780 is an apocalyptic number.

20156316780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20156316780 is an abundant number, since it is smaller than the sum of its proper divisors (36281370372).

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

20156316780 is a wasteful number, since it uses less digits than its factorization.

20156316780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335938625 (or 335938623 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 20156316780 in words is "twenty billion, one hundred fifty-six million, three hundred sixteen thousand, seven hundred eighty".