20154166442 has 4 divisors (see below), whose sum is σ = 30231249666. Its totient is φ = 10077083220.

The previous prime is 20154166441. The next prime is 20154166447. The reversal of 20154166442 is 24466145102.

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., 17289883081 + 2864283361 = 131491^2 + 53519^2 .

It is not an unprimeable number, because it can be changed into a prime (20154166441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5038541609 + ... + 5038541612.

Almost surely, 2^20154166442 is an apocalyptic number.

20154166442 is a deficient number, since it is larger than the sum of its proper divisors (10077083224).

20154166442 is a wasteful number, since it uses less digits than its factorization.

20154166442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10077083223.

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 20154166442 in words is "twenty billion, one hundred fifty-four million, one hundred sixty-six thousand, four hundred forty-two".