20605705000 has 40 divisors (see below), whose sum is σ = 48279178530. Its totient is φ = 8242280000.

The previous prime is 20605704997. The next prime is 20605705007. The reversal of 20605705000 is 50750602.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 40424164 + 20565280836 = 6358^2 + 143406^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20605705007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2055571 + ... + 2065570.

Almost surely, 2^20605705000 is an apocalyptic number.

20605705000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20605705000 is an abundant number, since it is smaller than the sum of its proper divisors (27673473530).

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

20605705000 is an equidigital number, since it uses as much as digits as its factorization.

20605705000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121167 (or 4121148 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The spelling of 20605705000 in words is "twenty billion, six hundred five million, seven hundred five thousand".