20400232420430 has 32 divisors (see below), whose sum is σ = 38880825072480. Its totient is φ = 7680012021760.

The previous prime is 20400232420339. The next prime is 20400232420433. The reversal of 20400232420430 is 3402423200402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400232420430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400232420433) 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, 18588341 + ... + 19655199.

It is an arithmetic number, because the mean of its divisors is an integer number (1215025783515).

Almost surely, 2^{20400232420430} is an apocalyptic number.

20400232420430 is a deficient number, since it is larger than the sum of its proper divisors (18480592652050).

20400232420430 is a wasteful number, since it uses less digits than its factorization.

20400232420430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179364.

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20400232420430 its reverse (3402423200402), we get a palindrome (23802655620832).

The spelling of 20400232420430 in words is "twenty trillion, four hundred billion, two hundred thirty-two million, four hundred twenty thousand, four hundred thirty".