20902137 has 8 divisors (see below), whose sum is σ = 27942720. Its totient is φ = 13898160.

The previous prime is 20902121. The next prime is 20902159. The reversal of 20902137 is 73120902.

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

It is not a de Polignac number, because 20902137 - 2⁴ = 20902121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20902117) 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, 7789 + ... + 10122.

It is an arithmetic number, because the mean of its divisors is an integer number (3492840).

Almost surely, 2^20902137 is an apocalyptic number.

It is an amenable number.

20902137 is a deficient number, since it is larger than the sum of its proper divisors (7040583).

20902137 is a wasteful number, since it uses less digits than its factorization.

20902137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18303.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20902137 is about 4571.8854972538. The cubic root of 20902137 is about 275.4631841564.

The spelling of 20902137 in words is "twenty million, nine hundred two thousand, one hundred thirty-seven".