20634019 has 16 divisors (see below), whose sum is σ = 24998400. Its totient is φ = 16637184.

The previous prime is 20634017. The next prime is 20634037. The reversal of 20634019 is 91043602.

It is a cyclic number.

It is not a de Polignac number, because 20634019 - 2¹ = 20634017 is a prime.

It is a super-2 number, since 2×20634019² = 851525480184722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20633984 and 20634002.

It is not an unprimeable number, because it can be changed into a prime (20634017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21747 + ... + 22675.

It is an arithmetic number, because the mean of its divisors is an integer number (1562400).

Almost surely, 2^20634019 is an apocalyptic number.

20634019 is a deficient number, since it is larger than the sum of its proper divisors (4364381).

20634019 is a wasteful number, since it uses less digits than its factorization.

20634019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20634019 is about 4542.4683818382. The cubic root of 20634019 is about 274.2802955098.

It can be divided in two parts, 206 and 34019, that added together give a square (34225 = 185²).

The spelling of 20634019 in words is "twenty million, six hundred thirty-four thousand, nineteen".