20235440645 has 32 divisors (see below), whose sum is σ = 27983543040. Its totient is φ = 13760110080.

The previous prime is 20235440639. The next prime is 20235440669. The reversal of 20235440645 is 54604453202.

It is not a de Polignac number, because 20235440645 - 2⁶ = 20235440581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2472410 + ... + 2480580.

It is an arithmetic number, because the mean of its divisors is an integer number (874485720).

Almost surely, 2^20235440645 is an apocalyptic number.

It is an amenable number.

20235440645 is a deficient number, since it is larger than the sum of its proper divisors (7748102395).

20235440645 is a wasteful number, since it uses less digits than its factorization.

20235440645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8765.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 20235440645 its reverse (54604453202), we get a palindrome (74839893847).

The spelling of 20235440645 in words is "twenty billion, two hundred thirty-five million, four hundred forty thousand, six hundred forty-five".