20406430402 has 8 divisors (see below), whose sum is σ = 31436933436. Its totient is φ = 9927452592.

The previous prime is 20406430397. The next prime is 20406430409. The reversal of 20406430402 is 20403460402.

It can be written as a sum of positive squares in 2 ways, for example, as 20406408201 + 22201 = 142851^2 + 149^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20406430409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137881213 + ... + 137881360.

Almost surely, 2^20406430402 is an apocalyptic number.

20406430402 is a deficient number, since it is larger than the sum of its proper divisors (11030503034).

20406430402 is a wasteful number, since it uses less digits than its factorization.

20406430402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275762612.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20406430402 its reverse (20403460402), we get a palindrome (40809890804).

The spelling of 20406430402 in words is "twenty billion, four hundred six million, four hundred thirty thousand, four hundred two".