20153431 has 4 divisors (see below), whose sum is σ = 20266200. Its totient is φ = 20040664.

The previous prime is 20153429. The next prime is 20153443. The reversal of 20153431 is 13435102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13435102 = 2 ⋅6717551.

It is a cyclic number.

It is not a de Polignac number, because 20153431 - 2¹ = 20153429 is a prime.

It is a super-2 number, since 2×20153431² = 812321562143522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20153399 and 20153408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56116 + ... + 56473.

It is an arithmetic number, because the mean of its divisors is an integer number (5066550).

Almost surely, 2^20153431 is an apocalyptic number.

20153431 is a deficient number, since it is larger than the sum of its proper divisors (112769).

20153431 is a wasteful number, since it uses less digits than its factorization.

20153431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112768.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20153431 is about 4489.2572882382. The cubic root of 20153431 is about 272.1341205266.

Adding to 20153431 its reverse (13435102), we get a palindrome (33588533).

The spelling of 20153431 in words is "twenty million, one hundred fifty-three thousand, four hundred thirty-one".