20602906 has 4 divisors (see below), whose sum is σ = 30904362. Its totient is φ = 10301452.

The previous prime is 20602867. The next prime is 20602913. The reversal of 20602906 is 60920602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60920602 = 2 ⋅30460301.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 2752281 = 4225^2 + 1659^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5150725 + ... + 5150728.

Almost surely, 2^20602906 is an apocalyptic number.

20602906 is a deficient number, since it is larger than the sum of its proper divisors (10301456).

20602906 is a wasteful number, since it uses less digits than its factorization.

20602906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301455.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20602906 is about 4539.0424100244. The cubic root of 20602906 is about 274.1423683388.

The spelling of 20602906 in words is "twenty million, six hundred two thousand, nine hundred six".