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20406031 = 32096359
BaseRepresentation
bin100110111010…
…1111100001111
31102101201210221
41031311330033
520210443111
62005212211
7335306542
oct115657417
942351727
1020406031
1110578398
126a01067
1342c6199
1429d2859
151bd1371
hex1375f0f

20406031 has 4 divisors (see below), whose sum is σ = 20415600. Its totient is φ = 20396464.

The previous prime is 20406017. The next prime is 20406107. The reversal of 20406031 is 13060402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20406031 is a prime.

It is a super-2 number, since 2×204060312 = 832812202345922, 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 = 20405996 and 20406014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406011) 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, 30 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (5103900).

Almost surely, 220406031 is an apocalyptic number.

20406031 is a deficient number, since it is larger than the sum of its proper divisors (9569).

20406031 is an equidigital number, since it uses as much as digits as its factorization.

20406031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9568.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20406031 is about 4517.3035098386. The cubic root of 20406031 is about 273.2663655425.

Adding to 20406031 its reverse (13060402), we get a palindrome (33466433).

The spelling of 20406031 in words is "twenty million, four hundred six thousand, thirty-one".

Divisors: 1 3209 6359 20406031