20645460402 has 16 divisors (see below), whose sum is σ = 47189623872. Its totient is φ = 5898702960.

The previous prime is 20645460379. The next prime is 20645460427. The reversal of 20645460402 is 20406454602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245779249 + ... + 245779332.

It is an arithmetic number, because the mean of its divisors is an integer number (2949351492).

Almost surely, 2^20645460402 is an apocalyptic number.

20645460402 is an abundant number, since it is smaller than the sum of its proper divisors (26544163470).

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

20645460402 is a wasteful number, since it uses less digits than its factorization.

20645460402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491558593.

The product of its (nonzero) digits is 46080, while the sum is 33.

The spelling of 20645460402 in words is "twenty billion, six hundred forty-five million, four hundred sixty thousand, four hundred two".