20605490450 has 24 divisors (see below), whose sum is σ = 38332033572. Its totient is φ = 8240944320.

The previous prime is 20605490419. The next prime is 20605490527. The reversal of 20605490450 is 5409450602.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 18477236761 + 2128253689 = 135931^2 + 46133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20605490450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346292 + ... + 401408.

Almost surely, 2^20605490450 is an apocalyptic number.

20605490450 is a deficient number, since it is larger than the sum of its proper divisors (17726543122).

20605490450 is a wasteful number, since it uses less digits than its factorization.

20605490450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62606 (or 62601 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20605490450 in words is "twenty billion, six hundred five million, four hundred ninety thousand, four hundred fifty".