20199401 has 4 divisors (see below), whose sum is σ = 20218512. Its totient is φ = 20180292.

The previous prime is 20199397. The next prime is 20199409. The reversal of 20199401 is 10499102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20199401 - 2² = 20199397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20199409) 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, 7871 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (5054628).

Almost surely, 2^20199401 is an apocalyptic number.

It is an amenable number.

20199401 is a deficient number, since it is larger than the sum of its proper divisors (19111).

20199401 is a wasteful number, since it uses less digits than its factorization.

20199401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19110.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20199401 is about 4494.3743724794. The cubic root of 20199401 is about 272.3408761534.

The spelling of 20199401 in words is "twenty million, one hundred ninety-nine thousand, four hundred one".