20261019 has 8 divisors (see below), whose sum is σ = 27035712. Its totient is φ = 13496840.

The previous prime is 20261009. The next prime is 20261023. The reversal of 20261019 is 91016202.

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 20261019 - 2¹¹ = 20258971 is a prime.

It is a super-2 number, since 2×20261019² = 821017781836722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20260986 and 20261004.

It is not an unprimeable number, because it can be changed into a prime (20261009) 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, 5224 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (3379464).

Almost surely, 2^20261019 is an apocalyptic number.

20261019 is a deficient number, since it is larger than the sum of its proper divisors (6774693).

20261019 is a wasteful number, since it uses less digits than its factorization.

20261019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20261019 is about 4501.2241668240. The cubic root of 20261019 is about 272.6175191004.

The spelling of 20261019 in words is "twenty million, two hundred sixty-one thousand, nineteen".