20453431636 has 24 divisors (see below), whose sum is σ = 39051250560. Its totient is φ = 9296112000.

The previous prime is 20453431601. The next prime is 20453431637. The reversal of 20453431636 is 63613435402.

It is a junction number, because it is equal to n+sod(n) for n = 20453431595 and 20453431604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453431637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685836 + ... + 715036.

It is an arithmetic number, because the mean of its divisors is an integer number (1627135440).

Almost surely, 2^20453431636 is an apocalyptic number.

It is an amenable number.

20453431636 is a deficient number, since it is larger than the sum of its proper divisors (18597818924).

20453431636 is a wasteful number, since it uses less digits than its factorization.

20453431636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45135 (or 45133 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 37.

The spelling of 20453431636 in words is "twenty billion, four hundred fifty-three million, four hundred thirty-one thousand, six hundred thirty-six".