20690705800 has 24 divisors (see below), whose sum is σ = 48105891450. Its totient is φ = 8276282240.

The previous prime is 20690705779. The next prime is 20690705807. The reversal of 20690705800 is 850709602.

It can be written as a sum of positive squares in 3 ways, for example, as 13556876356 + 7133829444 = 116434^2 + 84462^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20690705800.

It is not an unprimeable number, because it can be changed into a prime (20690705807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51726565 + ... + 51726964.

Almost surely, 2^20690705800 is an apocalyptic number.

20690705800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20690705800 is an abundant number, since it is smaller than the sum of its proper divisors (27415185650).

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

20690705800 is a wasteful number, since it uses less digits than its factorization.

20690705800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103453545 (or 103453536 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 20690705800 in words is "twenty billion, six hundred ninety million, seven hundred five thousand, eight hundred".