20519901 has 24 divisors (see below), whose sum is σ = 32123520. Its totient is φ = 12571776.

The previous prime is 20519899. The next prime is 20519903. The reversal of 20519901 is 10991502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20519899) and next prime (20519903).

It is not a de Polignac number, because 20519901 - 2¹ = 20519899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20519903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5020 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (1338480).

Almost surely, 2^20519901 is an apocalyptic number.

It is an amenable number.

20519901 is a deficient number, since it is larger than the sum of its proper divisors (11603619).

20519901 is a wasteful number, since it uses less digits than its factorization.

20519901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185 (or 3182 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 20519901 is about 4529.8897337573. The cubic root of 20519901 is about 273.7737178424.

The spelling of 20519901 in words is "twenty million, five hundred nineteen thousand, nine hundred one".