20324400154 has 4 divisors (see below), whose sum is σ = 30486600234. Its totient is φ = 10162200076.

The previous prime is 20324400137. The next prime is 20324400163. The reversal of 20324400154 is 45100442302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45100442302 = 2 ⋅22550221151.

It can be written as a sum of positive squares in only one way, i.e., 19615403025 + 708997129 = 140055^2 + 26627^2 .

It is a super-4 number, since 4×20324400154⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5081100037 + ... + 5081100040.

Almost surely, 2^20324400154 is an apocalyptic number.

20324400154 is a deficient number, since it is larger than the sum of its proper divisors (10162200080).

20324400154 is a wasteful number, since it uses less digits than its factorization.

20324400154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10162200079.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20324400154 its reverse (45100442302), we get a palindrome (65424842456).

The spelling of 20324400154 in words is "twenty billion, three hundred twenty-four million, four hundred thousand, one hundred fifty-four".