20211874 has 4 divisors (see below), whose sum is σ = 30317814. Its totient is φ = 10105936.

The previous prime is 20211857. The next prime is 20211899. The reversal of 20211874 is 47811202.

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: 47811202 = 2 ⋅23905601.

It can be written as a sum of positive squares in only one way, i.e., 13373649 + 6838225 = 3657^2 + 2615^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052967 + ... + 5052970.

Almost surely, 2^20211874 is an apocalyptic number.

20211874 is a deficient number, since it is larger than the sum of its proper divisors (10105940).

20211874 is a wasteful number, since it uses less digits than its factorization.

20211874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105939.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20211874 is about 4495.7617819453. The cubic root of 20211874 is about 272.3969208648.

The spelling of 20211874 in words is "twenty million, two hundred eleven thousand, eight hundred seventy-four".