20870479 has 16 divisors (see below), whose sum is σ = 24917056. Its totient is φ = 17107200.

The previous prime is 20870467. The next prime is 20870489. The reversal of 20870479 is 97407802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20870479 - 2⁹ = 20869967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870429) 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, 15139 + ... + 16459.

It is an arithmetic number, because the mean of its divisors is an integer number (1557316).

Almost surely, 2^20870479 is an apocalyptic number.

20870479 is a deficient number, since it is larger than the sum of its proper divisors (4046577).

20870479 is a wasteful number, since it uses less digits than its factorization.

20870479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20870479 is about 4568.4219376060. The cubic root of 20870479 is about 275.3240433613.

The spelling of 20870479 in words is "twenty million, eight hundred seventy thousand, four hundred seventy-nine".