20377605720 has 128 divisors (see below), whose sum is σ = 63560448000. Its totient is φ = 5220771840.

The previous prime is 20377605671. The next prime is 20377605739. The reversal of 20377605720 is 2750677302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497376 + ... + 536784.

It is an arithmetic number, because the mean of its divisors is an integer number (496566000).

Almost surely, 2^20377605720 is an apocalyptic number.

20377605720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20377605720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31780224000).

20377605720 is an abundant number, since it is smaller than the sum of its proper divisors (43182842280).

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

20377605720 is a wasteful number, since it uses less digits than its factorization.

20377605720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39593 (or 39589 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 39.

The spelling of 20377605720 in words is "twenty billion, three hundred seventy-seven million, six hundred five thousand, seven hundred twenty".