20120899 has 2 divisors, whose sum is σ = 20120900. Its totient is φ = 20120898.

The previous prime is 20120887. The next prime is 20120923. The reversal of 20120899 is 99802102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120899.

It is not a weakly prime, because it can be changed into another prime (20120819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060449 + 10060450.

It is an arithmetic number, because the mean of its divisors is an integer number (10060450).

Almost surely, 2^20120899 is an apocalyptic number.

20120899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120899 is an equidigital number, since it uses as much as digits as its factorization.

20120899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 20120899 is about 4485.6325083538. The cubic root of 20120899 is about 271.9876138751.

The spelling of 20120899 in words is "twenty million, one hundred twenty thousand, eight hundred ninety-nine".