20400253553464 has 16 divisors (see below), whose sum is σ = 38250556975800. Its totient is φ = 10200105026592.

The previous prime is 20400253553461. The next prime is 20400253553467. The reversal of 20400253553464 is 46435535200402.

It is an interprime number because it is at equal distance from previous prime (20400253553461) and next prime (20400253553467).

It is a self number, because there is not a number n which added to its sum of digits gives 20400253553464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400253553461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687539 + ... + 6606685.

Almost surely, 2^{20400253553464} is an apocalyptic number.

It is an amenable number.

20400253553464 is a deficient number, since it is larger than the sum of its proper divisors (17850303422336).

20400253553464 is a wasteful number, since it uses less digits than its factorization.

20400253553464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5437542 (or 5437538 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 43.

Adding to 20400253553464 its reverse (46435535200402), we get a palindrome (66835788753866).

The spelling of 20400253553464 in words is "twenty trillion, four hundred billion, two hundred fifty-three million, five hundred fifty-three thousand, four hundred sixty-four".