20011773780 has 72 divisors (see below), whose sum is σ = 60798925824. Its totient is φ = 5327985600.

The previous prime is 20011773773. The next prime is 20011773791. The reversal of 20011773780 is 8737711002.

It is a happy number.

20011773780 is a `hidden beast` number, since 200 + 11 + 77 + 378 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25485 + ... + 201675.

Almost surely, 2^20011773780 is an apocalyptic number.

20011773780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011773780 is an abundant number, since it is smaller than the sum of its proper divisors (40787152044).

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

20011773780 is a wasteful number, since it uses less digits than its factorization.

20011773780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176837 (or 176832 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The spelling of 20011773780 in words is "twenty billion, eleven million, seven hundred seventy-three thousand, seven hundred eighty".