20400423102 has 64 divisors (see below), whose sum is σ = 45538931520. Its totient is φ = 6769526400.

The previous prime is 20400423089. The next prime is 20400423103. The reversal of 20400423102 is 20132400402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400423103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18664068 + ... + 18665160.

It is an arithmetic number, because the mean of its divisors is an integer number (711545805).

Almost surely, 2^20400423102 is an apocalyptic number.

20400423102 is an abundant number, since it is smaller than the sum of its proper divisors (25138508418).

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

20400423102 is a wasteful number, since it uses less digits than its factorization.

20400423102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2340 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20400423102 its reverse (20132400402), we get a palindrome (40532823504).

The spelling of 20400423102 in words is "twenty billion, four hundred million, four hundred twenty-three thousand, one hundred two".