20115464 has 8 divisors (see below), whose sum is σ = 37716510. Its totient is φ = 10057728.

The previous prime is 20115451. The next prime is 20115467. The reversal of 20115464 is 46451102.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 3648100 = 4058^2 + 1910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20115467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257209 + ... + 1257224.

Almost surely, 2^20115464 is an apocalyptic number.

It is an amenable number.

20115464 is a deficient number, since it is larger than the sum of its proper divisors (17601046).

20115464 is a wasteful number, since it uses less digits than its factorization.

20115464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514439 (or 2514435 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20115464 is about 4485.0266442910. The cubic root of 20115464 is about 271.9631221629.

Adding to 20115464 its reverse (46451102), we get a palindrome (66566566).

It can be divided in two parts, 20115 and 464, that multiplied together give a triangular number (9333360 = T₄₃₂₀).

The spelling of 20115464 in words is "twenty million, one hundred fifteen thousand, four hundred sixty-four".