20379749 has 8 divisors (see below), whose sum is σ = 22014552. Its totient is φ = 18754560.

The previous prime is 20379739. The next prime is 20379757. The reversal of 20379749 is 94797302.

It can be written as a sum of positive squares in 4 ways, for example, as 174724 + 20205025 = 418^2 + 4495^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20379749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20379739) 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, 2369 + ... + 6809.

It is an arithmetic number, because the mean of its divisors is an integer number (2751819).

Almost surely, 2^20379749 is an apocalyptic number.

It is an amenable number.

20379749 is a deficient number, since it is larger than the sum of its proper divisors (1634803).

20379749 is a wasteful number, since it uses less digits than its factorization.

20379749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4807.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20379749 is about 4514.3935362350. The cubic root of 20379749 is about 273.1489971008.

The spelling of 20379749 in words is "twenty million, three hundred seventy-nine thousand, seven hundred forty-nine".