20377511720 has 64 divisors (see below), whose sum is σ = 49858552080. Its totient is φ = 7464185856.

The previous prime is 20377511719. The next prime is 20377511729. The reversal of 20377511720 is 2711577302.

It can be written as a sum of positive squares in 8 ways, for example, as 17962968676 + 2414543044 = 134026^2 + 49138^2 .

It is not an unprimeable number, because it can be changed into a prime (20377511729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379799 + ... + 430118.

Almost surely, 2^20377511720 is an apocalyptic number.

20377511720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20377511720 is an abundant number, since it is smaller than the sum of its proper divisors (29481040360).

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

20377511720 is a wasteful number, since it uses less digits than its factorization.

20377511720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809982 (or 809978 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 35.

The spelling of 20377511720 in words is "twenty billion, three hundred seventy-seven million, five hundred eleven thousand, seven hundred twenty".