20400602 has 4 divisors (see below), whose sum is σ = 30600906. Its totient is φ = 10200300.

The previous prime is 20400599. The next prime is 20400631. The reversal of 20400602 is 20600402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20600402 = 2 ⋅10300201.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 7946761 = 3529^2 + 2819^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100149 + ... + 5100152.

Almost surely, 2^20400602 is an apocalyptic number.

20400602 is a deficient number, since it is larger than the sum of its proper divisors (10200304).

20400602 is a wasteful number, since it uses less digits than its factorization.

20400602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200303.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20400602 is about 4516.7025582830. The cubic root of 20400602 is about 273.2421293305.

The spelling of 20400602 in words is "twenty million, four hundred thousand, six hundred two".