20919401 has 8 divisors (see below), whose sum is σ = 22514184. Its totient is φ = 19365120.

The previous prime is 20919383. The next prime is 20919419. The reversal of 20919401 is 10491902.

It is an interprime number because it is at equal distance from previous prime (20919383) and next prime (20919419).

It can be written as a sum of positive squares in 4 ways, for example, as 6864400 + 14055001 = 2620^2 + 3749^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20919401 - 2⁶ = 20919337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20919421) 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, 9050 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (2814273).

Almost surely, 2^20919401 is an apocalyptic number.

It is an amenable number.

20919401 is a deficient number, since it is larger than the sum of its proper divisors (1594783).

20919401 is a wasteful number, since it uses less digits than its factorization.

20919401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20251.

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

The square root of 20919401 is about 4573.7731688399. The cubic root of 20919401 is about 275.5390023646.

The spelling of 20919401 in words is "twenty million, nine hundred nineteen thousand, four hundred one".