20423543402 has 16 divisors (see below), whose sum is σ = 32921536320. Its totient is φ = 9467629248.

The previous prime is 20423543377. The next prime is 20423543423. The reversal of 20423543402 is 20434532402.

It is a happy number.

It is a super-2 number, since 2×20423543402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4480502 + ... + 4485057.

It is an arithmetic number, because the mean of its divisors is an integer number (2057596020).

Almost surely, 2^20423543402 is an apocalyptic number.

20423543402 is a deficient number, since it is larger than the sum of its proper divisors (12497992918).

20423543402 is a wasteful number, since it uses less digits than its factorization.

20423543402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8965645.

The product of its (nonzero) digits is 23040, while the sum is 29.

The spelling of 20423543402 in words is "twenty billion, four hundred twenty-three million, five hundred forty-three thousand, four hundred two".