20502899 has 4 divisors (see below), whose sum is σ = 20706000. Its totient is φ = 20299800.

The previous prime is 20502887. The next prime is 20502907. The reversal of 20502899 is 99820502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99820502 = 2 ⋅49910251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20502899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20502809) 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, 101399 + ... + 101600.

It is an arithmetic number, because the mean of its divisors is an integer number (5176500).

Almost surely, 2^20502899 is an apocalyptic number.

20502899 is a deficient number, since it is larger than the sum of its proper divisors (203101).

20502899 is a wasteful number, since it uses less digits than its factorization.

20502899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203100.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 20502899 is about 4528.0126987454. The cubic root of 20502899 is about 273.6980841619.

The spelling of 20502899 in words is "twenty million, five hundred two thousand, eight hundred ninety-nine".