20655142 has 4 divisors (see below), whose sum is σ = 30982716. Its totient is φ = 10327570.

The previous prime is 20655101. The next prime is 20655143. The reversal of 20655142 is 24155602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24155602 = 2 ⋅12077801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5163784 + ... + 5163787.

It is an arithmetic number, because the mean of its divisors is an integer number (7745679).

Almost surely, 2^20655142 is an apocalyptic number.

20655142 is a deficient number, since it is larger than the sum of its proper divisors (10327574).

20655142 is a wasteful number, since it uses less digits than its factorization.

20655142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10327573.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20655142 is about 4544.7928445640. The cubic root of 20655142 is about 274.3738569698.

The spelling of 20655142 in words is "twenty million, six hundred fifty-five thousand, one hundred forty-two".