20274921 has 16 divisors (see below), whose sum is σ = 30241920. Its totient is φ = 13424400.

The previous prime is 20274913. The next prime is 20274941. The reversal of 20274921 is 12947202.

It is not a de Polignac number, because 20274921 - 2³ = 20274913 is a prime.

It is a super-2 number, since 2×20274921² = 822144843112482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20274901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (1890120).

Almost surely, 2^20274921 is an apocalyptic number.

It is an amenable number.

20274921 is a deficient number, since it is larger than the sum of its proper divisors (9966999).

20274921 is a wasteful number, since it uses less digits than its factorization.

20274921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133 (or 5127 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20274921 is about 4502.7681485948. The cubic root of 20274921 is about 272.6798565749.

The spelling of 20274921 in words is "twenty million, two hundred seventy-four thousand, nine hundred twenty-one".