19900955 has 4 divisors (see below), whose sum is σ = 23881152. Its totient is φ = 15920760.

The previous prime is 19900927. The next prime is 19900967. The reversal of 19900955 is 55900991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55900991 = 73 ⋅765767.

It is not a de Polignac number, because 19900955 - 2⁶ = 19900891 is a prime.

It is a Duffinian 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, 1990091 + ... + 1990100.

It is an arithmetic number, because the mean of its divisors is an integer number (5970288).

Almost surely, 2^19900955 is an apocalyptic number.

19900955 is a deficient number, since it is larger than the sum of its proper divisors (3980197).

19900955 is an equidigital number, since it uses as much as digits as its factorization.

19900955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980196.

The product of its (nonzero) digits is 18225, while the sum is 38.

The square root of 19900955 is about 4461.0486435366. The cubic root of 19900955 is about 270.9929374575.

The spelling of 19900955 in words is "nineteen million, nine hundred thousand, nine hundred fifty-five".