20864999242 has 4 divisors (see below), whose sum is σ = 31297498866. Its totient is φ = 10432499620.

The previous prime is 20864999231. The next prime is 20864999273. The reversal of 20864999242 is 24299946802.

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., 11815472601 + 9049526641 = 108699^2 + 95129^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5216249809 + ... + 5216249812.

Almost surely, 2^20864999242 is an apocalyptic number.

20864999242 is a deficient number, since it is larger than the sum of its proper divisors (10432499624).

20864999242 is a wasteful number, since it uses less digits than its factorization.

20864999242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432499623.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 20864999242 in words is "twenty billion, eight hundred sixty-four million, nine hundred ninety-nine thousand, two hundred forty-two".