20642602 has 4 divisors (see below), whose sum is σ = 30963906. Its totient is φ = 10321300.

The previous prime is 20642597. The next prime is 20642603. The reversal of 20642602 is 20624602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20624602 = 2 ⋅10312301.

It can be written as a sum of positive squares in only one way, i.e., 17816841 + 2825761 = 4221^2 + 1681^2 .

It is a super-2 number, since 2×20642602² = 852234034660808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20642603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160649 + ... + 5160652.

Almost surely, 2^20642602 is an apocalyptic number.

20642602 is a deficient number, since it is larger than the sum of its proper divisors (10321304).

20642602 is a wasteful number, since it uses less digits than its factorization.

20642602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10321303.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20642602 is about 4543.4130342728. The cubic root of 20642602 is about 274.3183204407.

The spelling of 20642602 in words is "twenty million, six hundred forty-two thousand, six hundred two".