20420902402 has 8 divisors (see below), whose sum is σ = 30632107212. Its totient is φ = 10210200000.

The previous prime is 20420902387. The next prime is 20420902423.

It is a happy number.

20420902402 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 20135326201 + 285576201 = 141899^2 + 16899^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1902 + ... + 202102.

Almost surely, 2^20420902402 is an apocalyptic number.

20420902402 is a deficient number, since it is larger than the sum of its proper divisors (10211204810).

20420902402 is a wasteful number, since it uses less digits than its factorization.

20420902402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251204.

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 20420902402 in words is "twenty billion, four hundred twenty million, nine hundred two thousand, four hundred two".