20858720438 has 8 divisors (see below), whose sum is σ = 32366980080. Its totient is φ = 10069727080.

The previous prime is 20858720423. The next prime is 20858720453. The reversal of 20858720438 is 83402785802.

It is an interprime number because it is at equal distance from previous prime (20858720423) and next prime (20858720453).

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

It is a junction number, because it is equal to n+sod(n) for n = 20858720392 and 20858720401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179816498 + ... + 179816613.

It is an arithmetic number, because the mean of its divisors is an integer number (4045872510).

Almost surely, 2^20858720438 is an apocalyptic number.

20858720438 is a deficient number, since it is larger than the sum of its proper divisors (11508259642).

20858720438 is a wasteful number, since it uses less digits than its factorization.

20858720438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359633142.

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 20858720438 in words is "twenty billion, eight hundred fifty-eight million, seven hundred twenty thousand, four hundred thirty-eight".