20545031 has 4 divisors (see below), whose sum is σ = 22125432. Its totient is φ = 18964632.

The previous prime is 20545001. The next prime is 20545037. The reversal of 20545031 is 13054502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13054502 = 2 ⋅6527251.

It is a cyclic number.

It is not a de Polignac number, because 20545031 - 2¹⁴ = 20528647 is a prime.

It is a super-2 number, since 2×20545031² = 844196597581922, 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 = 20544994 and 20545012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545037) 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, 790181 + ... + 790206.

It is an arithmetic number, because the mean of its divisors is an integer number (5531358).

Almost surely, 2^20545031 is an apocalyptic number.

20545031 is a deficient number, since it is larger than the sum of its proper divisors (1580401).

20545031 is a wasteful number, since it uses less digits than its factorization.

20545031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580400.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20545031 is about 4532.6626832360. The cubic root of 20545031 is about 273.8854325936.

Adding to 20545031 its reverse (13054502), we get a palindrome (33599533).

The spelling of 20545031 in words is "twenty million, five hundred forty-five thousand, thirty-one".