20259819 has 12 divisors (see below), whose sum is σ = 29371992. Its totient is φ = 13456800.

The previous prime is 20259809. The next prime is 20259823. The reversal of 20259819 is 91895202.

It is not a de Polignac number, because 20259819 - 2¹² = 20255723 is a prime.

It is a super-2 number, since 2×20259819² = 820920531825522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20259809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1477 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2447666).

Almost surely, 2^20259819 is an apocalyptic number.

20259819 is a deficient number, since it is larger than the sum of its proper divisors (9112173).

20259819 is a wasteful number, since it uses less digits than its factorization.

20259819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298 (or 8295 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20259819 is about 4501.0908677786. The cubic root of 20259819 is about 272.6121368854.

The spelling of 20259819 in words is "twenty million, two hundred fifty-nine thousand, eight hundred nineteen".