102020431 has 4 divisors (see below), whose sum is σ = 103543192. Its totient is φ = 100497672.

The previous prime is 102020419. The next prime is 102020447. The reversal of 102020431 is 134020201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102020431 is a prime.

It is a super-2 number, since 2×102020431² = 20816336682851522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020461) 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, 761280 + ... + 761413.

It is an arithmetic number, because the mean of its divisors is an integer number (25885798).

Almost surely, 2^102020431 is an apocalyptic number.

102020431 is a deficient number, since it is larger than the sum of its proper divisors (1522761).

102020431 is an equidigital number, since it uses as much as digits as its factorization.

102020431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522760.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 102020431 is about 10100.5163729386. The cubic root of 102020431 is about 467.2640669451.

Adding to 102020431 its reverse (134020201), we get a palindrome (236040632).

The spelling of 102020431 in words is "one hundred two million, twenty thousand, four hundred thirty-one".