20435623653 has 16 divisors (see below), whose sum is σ = 28859530176. Its totient is φ = 12818246400.

The previous prime is 20435623643. The next prime is 20435623673. The reversal of 20435623653 is 35632653402.

It is not a de Polignac number, because 20435623653 - 2¹³ = 20435615461 is a prime.

It is a super-2 number, since 2×20435623653² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20435623643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100803 + ... + 225903.

It is an arithmetic number, because the mean of its divisors is an integer number (1803720636).

Almost surely, 2^20435623653 is an apocalyptic number.

It is an amenable number.

20435623653 is a deficient number, since it is larger than the sum of its proper divisors (8423906523).

20435623653 is a wasteful number, since it uses less digits than its factorization.

20435623653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128324.

The product of its (nonzero) digits is 388800, while the sum is 39.

The spelling of 20435623653 in words is "twenty billion, four hundred thirty-five million, six hundred twenty-three thousand, six hundred fifty-three".