20242551 has 32 divisors (see below), whose sum is σ = 32693760. Its totient is φ = 10894464.

The previous prime is 20242549. The next prime is 20242559. The reversal of 20242551 is 15524202.

It is a happy number.

It is not a de Polignac number, because 20242551 - 2¹ = 20242549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20242559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25801 + ... + 26573.

It is an arithmetic number, because the mean of its divisors is an integer number (1021680).

Almost surely, 2^20242551 is an apocalyptic number.

20242551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20242551 is a deficient number, since it is larger than the sum of its proper divisors (12451209).

20242551 is a wasteful number, since it uses less digits than its factorization.

20242551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20242551 is about 4499.1722572047. The cubic root of 20242551 is about 272.5346632672.

Adding to 20242551 its reverse (15524202), we get a palindrome (35766753).

The spelling of 20242551 in words is "twenty million, two hundred forty-two thousand, five hundred fifty-one".