20342864 has 10 divisors (see below), whose sum is σ = 39414330. Its totient is φ = 10171424.

The previous prime is 20342807. The next prime is 20342873. The reversal of 20342864 is 46824302.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 2534464 = 4220^2 + 1592^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635699 + ... + 635730.

It is an arithmetic number, because the mean of its divisors is an integer number (3941433).

Almost surely, 2^20342864 is an apocalyptic number.

It is an amenable number.

20342864 is a deficient number, since it is larger than the sum of its proper divisors (19071466).

20342864 is a wasteful number, since it uses less digits than its factorization.

20342864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271437 (or 1271431 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20342864 is about 4510.3064197458. The cubic root of 20342864 is about 272.9841081689.

The spelling of 20342864 in words is "twenty million, three hundred forty-two thousand, eight hundred sixty-four".