1020450205431 has 48 divisors (see below), whose sum is σ = 1596401399520. Its totient is φ = 644144140800.

The previous prime is 1020450205403. The next prime is 1020450205477. The reversal of 1020450205431 is 1345020540201.

1020450205431 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 450 + 205 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 1020450205431 - 2⁹ = 1020450204919 is a prime.

It is a super-2 number, since 2×1020450205431² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1020450205395 and 1020450205404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020450205631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18501511 + ... + 18556583.

It is an arithmetic number, because the mean of its divisors is an integer number (33258362490).

Almost surely, 2^{1020450205431} is an apocalyptic number.

1020450205431 is a deficient number, since it is larger than the sum of its proper divisors (575951194089).

1020450205431 is a wasteful number, since it uses less digits than its factorization.

1020450205431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57021 (or 56996 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 1020450205431 its reverse (1345020540201), we get a palindrome (2365470745632).

The spelling of 1020450205431 in words is "one trillion, twenty billion, four hundred fifty million, two hundred five thousand, four hundred thirty-one".