20651142 has 32 divisors (see below), whose sum is σ = 42849792. Its totient is φ = 6630624.

The previous prime is 20651117. The next prime is 20651149. The reversal of 20651142 is 24115602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651149) 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, 18348 + ... + 19440.

It is an arithmetic number, because the mean of its divisors is an integer number (1339056).

Almost surely, 2^20651142 is an apocalyptic number.

20651142 is an abundant number, since it is smaller than the sum of its proper divisors (22198650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20651142 is a wasteful number, since it uses less digits than its factorization.

20651142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20651142 is about 4544.3527591946. The cubic root of 20651142 is about 274.3561444106.

Adding to 20651142 its reverse (24115602), we get a palindrome (44766744).

The spelling of 20651142 in words is "twenty million, six hundred fifty-one thousand, one hundred forty-two".