19172020 has 24 divisors (see below), whose sum is σ = 46013184. Its totient is φ = 6573216.

The previous prime is 19172011. The next prime is 19172029. The reversal of 19172020 is 2027191.

It is an interprime number because it is at equal distance from previous prime (19172011) and next prime (19172029).

It is a junction number, because it is equal to n+sod(n) for n = 19171982 and 19172000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19172029) 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, 68332 + ... + 68611.

It is an arithmetic number, because the mean of its divisors is an integer number (1917216).

Almost surely, 2^19172020 is an apocalyptic number.

19172020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19172020 is an abundant number, since it is smaller than the sum of its proper divisors (26841164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19172020 is a wasteful number, since it uses less digits than its factorization.

19172020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136959 (or 136957 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 19172020 is about 4378.5865299204. The cubic root of 19172020 is about 267.6430422549.

The spelling of 19172020 in words is "nineteen million, one hundred seventy-two thousand, twenty".