19420951 has 4 divisors (see below), whose sum is σ = 21186504. Its totient is φ = 17655400.

The previous prime is 19420943. The next prime is 19420979. The reversal of 19420951 is 15902491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19420951 - 2³ = 19420943 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19423951) 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, 882760 + ... + 882781.

It is an arithmetic number, because the mean of its divisors is an integer number (5296626).

Almost surely, 2^19420951 is an apocalyptic number.

19420951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19420951 is a deficient number, since it is larger than the sum of its proper divisors (1765553).

19420951 is a wasteful number, since it uses less digits than its factorization.

19420951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765552.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 19420951 is about 4406.9208070942. The cubic root of 19420951 is about 268.7964307016.

The spelling of 19420951 in words is "nineteen million, four hundred twenty thousand, nine hundred fifty-one".