20621452045 has 16 divisors (see below), whose sum is σ = 25393375728. Its totient is φ = 16066805760.

The previous prime is 20621452021. The next prime is 20621452067. The reversal of 20621452045 is 54025412602.

It can be written as a sum of positive squares in 8 ways, for example, as 721835689 + 19899616356 = 26867^2 + 141066^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20621452045 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20621451998 and 20621452016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31117 + ... + 205453.

It is an arithmetic number, because the mean of its divisors is an integer number (1587085983).

Almost surely, 2^20621452045 is an apocalyptic number.

It is an amenable number.

20621452045 is a deficient number, since it is larger than the sum of its proper divisors (4771923683).

20621452045 is a wasteful number, since it uses less digits than its factorization.

20621452045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174960.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 20621452045 its reverse (54025412602), we get a palindrome (74646864647).

The spelling of 20621452045 in words is "twenty billion, six hundred twenty-one million, four hundred fifty-two thousand, forty-five".