20400345142 has 8 divisors (see below), whose sum is σ = 30628415736. Its totient is φ = 10190873232.

The previous prime is 20400345137. The next prime is 20400345157. The reversal of 20400345142 is 24154300402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4646928 + ... + 4651315.

It is an arithmetic number, because the mean of its divisors is an integer number (3828551967).

Almost surely, 2^20400345142 is an apocalyptic number.

20400345142 is a deficient number, since it is larger than the sum of its proper divisors (10228070594).

20400345142 is a wasteful number, since it uses less digits than its factorization.

20400345142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9299342.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20400345142 its reverse (24154300402), we get a palindrome (44554645544).

The spelling of 20400345142 in words is "twenty billion, four hundred million, three hundred forty-five thousand, one hundred forty-two".