20340120400 has 60 divisors (see below), whose sum is σ = 48899093472. Its totient is φ = 8130728320.

The previous prime is 20340120379. The next prime is 20340120401. The reversal of 20340120400 is 402104302.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340120401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626979 + ... + 658621.

Almost surely, 2^20340120400 is an apocalyptic number.

20340120400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340120400 is an abundant number, since it is smaller than the sum of its proper divisors (28558973072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20340120400 is a wasteful number, since it uses less digits than its factorization.

20340120400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33268 (or 33257 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20340120400 its reverse (402104302), we get a palindrome (20742224702).

The spelling of 20340120400 in words is "twenty billion, three hundred forty million, one hundred twenty thousand, four hundred".