20408766340 has 48 divisors (see below), whose sum is σ = 43616833344. Its totient is φ = 8019388800.

The previous prime is 20408766319. The next prime is 20408766347. The reversal of 20408766340 is 4366780402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20408766293 and 20408766302.

It is not an unprimeable number, because it can be changed into a prime (20408766347) 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, 979107 + ... + 999733.

It is an arithmetic number, because the mean of its divisors is an integer number (908684028).

Almost surely, 2^20408766340 is an apocalyptic number.

20408766340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20408766340 is an abundant number, since it is smaller than the sum of its proper divisors (23208067004).

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

20408766340 is a wasteful number, since it uses less digits than its factorization.

20408766340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21508 (or 21506 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 20408766340 in words is "twenty billion, four hundred eight million, seven hundred sixty-six thousand, three hundred forty".