20312121445 has 48 divisors (see below), whose sum is σ = 31768071552. Its totient is φ = 12111454080.

The previous prime is 20312121433. The next prime is 20312121469. The reversal of 20312121445 is 54412121302.

It is not a de Polignac number, because 20312121445 - 2³¹ = 18164637797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 153799 + ... + 253531.

It is an arithmetic number, because the mean of its divisors is an integer number (661834824).

Almost surely, 2^20312121445 is an apocalyptic number.

It is an amenable number.

20312121445 is a deficient number, since it is larger than the sum of its proper divisors (11455950107).

20312121445 is a wasteful number, since it uses less digits than its factorization.

20312121445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99802 (or 99779 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20312121445 its reverse (54412121302), we get a palindrome (74724242747).

The spelling of 20312121445 in words is "twenty billion, three hundred twelve million, one hundred twenty-one thousand, four hundred forty-five".