20131465 has 8 divisors (see below), whose sum is σ = 24334920. Its totient is φ = 15987072.

The previous prime is 20131427. The next prime is 20131487. The reversal of 20131465 is 56413102.

It can be written as a sum of positive squares in 4 ways, for example, as 1261129 + 18870336 = 1123^2 + 4344^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20131465 - 2¹³ = 20123273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14010 + ... + 15379.

It is an arithmetic number, because the mean of its divisors is an integer number (3041865).

Almost surely, 2^20131465 is an apocalyptic number.

It is an amenable number.

20131465 is a deficient number, since it is larger than the sum of its proper divisors (4203455).

20131465 is a wasteful number, since it uses less digits than its factorization.

20131465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29531.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20131465 is about 4486.8101141011. The cubic root of 20131465 is about 272.0352147674.

Adding to 20131465 its reverse (56413102), we get a palindrome (76544567).

The spelling of 20131465 in words is "twenty million, one hundred thirty-one thousand, four hundred sixty-five".