20402870 has 8 divisors (see below), whose sum is σ = 36725184. Its totient is φ = 8161144.

The previous prime is 20402861. The next prime is 20402887. The reversal of 20402870 is 7820402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020134 + ... + 1020153.

It is an arithmetic number, because the mean of its divisors is an integer number (4590648).

Almost surely, 2^20402870 is an apocalyptic number.

20402870 is a deficient number, since it is larger than the sum of its proper divisors (16322314).

20402870 is a wasteful number, since it uses less digits than its factorization.

20402870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040294.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20402870 is about 4516.9536194209. The cubic root of 20402870 is about 273.2522546883.

The spelling of 20402870 in words is "twenty million, four hundred two thousand, eight hundred seventy".