20257715402 has 8 divisors (see below), whose sum is σ = 30387534912. Its totient is φ = 10128537100.

The previous prime is 20257715341. The next prime is 20257715407. The reversal of 20257715402 is 20451775202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20257715407) 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, 71474 + ... + 213597.

It is an arithmetic number, because the mean of its divisors is an integer number (3798441864).

Almost surely, 2^20257715402 is an apocalyptic number.

20257715402 is a deficient number, since it is larger than the sum of its proper divisors (10129819510).

20257715402 is a wasteful number, since it uses less digits than its factorization.

20257715402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320604.

The product of its (nonzero) digits is 39200, while the sum is 35.

The spelling of 20257715402 in words is "twenty billion, two hundred fifty-seven million, seven hundred fifteen thousand, four hundred two".