20101431 has 8 divisors (see below), whose sum is σ = 30630784. Its totient is φ = 11486520.

The previous prime is 20101427. The next prime is 20101483. The reversal of 20101431 is 13410102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20101431 - 2² = 20101427 is a prime.

It is a super-2 number, since 2×20101431² = 808135056495522, 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 (20101421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478585 + ... + 478626.

It is an arithmetic number, because the mean of its divisors is an integer number (3828848).

Almost surely, 2^20101431 is an apocalyptic number.

20101431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20101431 is a deficient number, since it is larger than the sum of its proper divisors (10529353).

20101431 is an equidigital number, since it uses as much as digits as its factorization.

20101431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957221.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20101431 is about 4483.4619436324. The cubic root of 20101431 is about 271.8998649210.

Adding to 20101431 its reverse (13410102), we get a palindrome (33511533).

The spelling of 20101431 in words is "twenty million, one hundred one thousand, four hundred thirty-one".