20777568340 has 24 divisors (see below), whose sum is σ = 45040407552. Its totient is φ = 8042929440.

The previous prime is 20777568311. The next prime is 20777568347. The reversal of 20777568340 is 4386577702.

It is a happy number.

It is a super-2 number, since 2×20777568340² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20777568347) 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, 16755484 + ... + 16756723.

It is an arithmetic number, because the mean of its divisors is an integer number (1876683648).

Almost surely, 2^20777568340 is an apocalyptic number.

20777568340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20777568340 is an abundant number, since it is smaller than the sum of its proper divisors (24262839212).

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

20777568340 is a wasteful number, since it uses less digits than its factorization.

20777568340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33512247 (or 33512245 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 20777568340 in words is "twenty billion, seven hundred seventy-seven million, five hundred sixty-eight thousand, three hundred forty".