20123143402 has 4 divisors (see below), whose sum is σ = 30184715106. Its totient is φ = 10061571700.

The previous prime is 20123143373. The next prime is 20123143441. The reversal of 20123143402 is 20434132102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20434132102 = 2 ⋅10217066051.

It can be written as a sum of positive squares in only one way, i.e., 16371458401 + 3751685001 = 127951^2 + 61251^2 .

It is a super-2 number, since 2×20123143402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030785849 + ... + 5030785852.

Almost surely, 2^20123143402 is an apocalyptic number.

20123143402 is a deficient number, since it is larger than the sum of its proper divisors (10061571704).

20123143402 is a wasteful number, since it uses less digits than its factorization.

20123143402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061571703.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20123143402 its reverse (20434132102), we get a palindrome (40557275504).

The spelling of 20123143402 in words is "twenty billion, one hundred twenty-three million, one hundred forty-three thousand, four hundred two".