20645007051 has 16 divisors (see below), whose sum is σ = 27751294208. Its totient is φ = 13651308000.

The previous prime is 20645007017. The next prime is 20645007059. The reversal of 20645007051 is 15070054602.

It is not a de Polignac number, because 20645007051 - 2¹³ = 20644998859 is a prime.

It is a super-2 number, since 2×20645007051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20645007059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264960 + ... + 333906.

It is an arithmetic number, because the mean of its divisors is an integer number (1734455888).

Almost surely, 2^20645007051 is an apocalyptic number.

20645007051 is a deficient number, since it is larger than the sum of its proper divisors (7106287157).

20645007051 is a wasteful number, since it uses less digits than its factorization.

20645007051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69762.

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 20645007051 in words is "twenty billion, six hundred forty-five million, seven thousand, fifty-one".