20274551 has 4 divisors (see below), whose sum is σ = 22117704. Its totient is φ = 18431400.

The previous prime is 20274533. The next prime is 20274559. The reversal of 20274551 is 15547202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20274551 - 2⁶ = 20274487 is a prime.

It is a super-2 number, since 2×20274551² = 822114836503202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20274551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20274559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921560 + ... + 921581.

It is an arithmetic number, because the mean of its divisors is an integer number (5529426).

Almost surely, 2^20274551 is an apocalyptic number.

20274551 is a deficient number, since it is larger than the sum of its proper divisors (1843153).

20274551 is a wasteful number, since it uses less digits than its factorization.

20274551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843152.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20274551 is about 4502.7270625700. The cubic root of 20274551 is about 272.6781978400.

The spelling of 20274551 in words is "twenty million, two hundred seventy-four thousand, five hundred fifty-one".