20454845402 has 4 divisors (see below), whose sum is σ = 30682268106. Its totient is φ = 10227422700.

The previous prime is 20454845399. The next prime is 20454845407.

20454845402 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19555505281 + 899340121 = 139841^2 + 29989^2 .

It is not an unprimeable number, because it can be changed into a prime (20454845407) by changing a digit.

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 as a sum of consecutive naturals, namely, 5113711349 + ... + 5113711352.

Almost surely, 2^20454845402 is an apocalyptic number.

20454845402 is a deficient number, since it is larger than the sum of its proper divisors (10227422704).

20454845402 is a wasteful number, since it uses less digits than its factorization.

20454845402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10227422703.

The product of its (nonzero) digits is 204800, while the sum is 38.

The spelling of 20454845402 in words is "twenty billion, four hundred fifty-four million, eight hundred forty-five thousand, four hundred two".