20495739 has 8 divisors (see below), whose sum is σ = 29812032. Its totient is φ = 12421640.

The previous prime is 20495731. The next prime is 20495749. The reversal of 20495739 is 93759402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20495739 - 2³ = 20495731 is a prime.

It is a super-2 number, since 2×20495739² = 840150634312242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20495697 and 20495706.

It is not an unprimeable number, because it can be changed into a prime (20495731) 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, 310509 + ... + 310574.

It is an arithmetic number, because the mean of its divisors is an integer number (3726504).

Almost surely, 2^20495739 is an apocalyptic number.

20495739 is a deficient number, since it is larger than the sum of its proper divisors (9316293).

20495739 is a wasteful number, since it uses less digits than its factorization.

20495739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621097.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 20495739 is about 4527.2219958822. The cubic root of 20495739 is about 273.6662202704. Note that the first 3 decimals are identical.

The spelling of 20495739 in words is "twenty million, four hundred ninety-five thousand, seven hundred thirty-nine".