20620140653 has 12 divisors (see below), whose sum is σ = 23998964220. Its totient is φ = 17665365312.

The previous prime is 20620140643. The next prime is 20620140703. The reversal of 20620140653 is 35604102602.

It can be written as a sum of positive squares in 2 ways, for example, as 1373295364 + 19246845289 = 37058^2 + 138733^2 .

It is not a de Polignac number, because 20620140653 - 2¹² = 20620136557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620140613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9968 + ... + 203321.

It is an arithmetic number, because the mean of its divisors is an integer number (1999913685).

Almost surely, 2^20620140653 is an apocalyptic number.

It is an amenable number.

20620140653 is a deficient number, since it is larger than the sum of its proper divisors (3378823567).

20620140653 is a wasteful number, since it uses less digits than its factorization.

20620140653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215276 (or 215269 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 20620140653 in words is "twenty billion, six hundred twenty million, one hundred forty thousand, six hundred fifty-three".