20464356436 has 6 divisors (see below), whose sum is σ = 35812623770. Its totient is φ = 10232178216.

The previous prime is 20464356361. The next prime is 20464356439. The reversal of 20464356436 is 63465346402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13075922500 + 7388433936 = 114350^2 + 85956^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20464356392 and 20464356401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464356439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2558044551 + ... + 2558044558.

Almost surely, 2^20464356436 is an apocalyptic number.

It is an amenable number.

20464356436 is a deficient number, since it is larger than the sum of its proper divisors (15348267334).

20464356436 is a wasteful number, since it uses less digits than its factorization.

20464356436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116089113 (or 5116089111 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 20464356436 in words is "twenty billion, four hundred sixty-four million, three hundred fifty-six thousand, four hundred thirty-six".