20715642 has 16 divisors (see below), whose sum is σ = 46034880. Its totient is φ = 6905196.

The previous prime is 20715641. The next prime is 20715647. The reversal of 20715642 is 24651702.

20715642 is a `hidden beast` number, since 2 + 0 + 7 + 15 + 642 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (20715641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191758 + ... + 191865.

It is an arithmetic number, because the mean of its divisors is an integer number (2877180).

Almost surely, 2^20715642 is an apocalyptic number.

20715642 is an abundant number, since it is smaller than the sum of its proper divisors (25319238).

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

20715642 is a wasteful number, since it uses less digits than its factorization.

20715642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383634 (or 383628 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20715642 is about 4551.4439467053. The cubic root of 20715642 is about 274.6414810093.

The spelling of 20715642 in words is "twenty million, seven hundred fifteen thousand, six hundred forty-two".