20801387 has 8 divisors (see below), whose sum is σ = 22441536. Its totient is φ = 19207552.

The previous prime is 20801383. The next prime is 20801393. The reversal of 20801387 is 78310802.

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

It is not a de Polignac number, because 20801387 - 2² = 20801383 is a prime.

It is a super-2 number, since 2×20801387² = 865395402247538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20801383) 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, 10643 + ... + 12444.

It is an arithmetic number, because the mean of its divisors is an integer number (2805192).

Almost surely, 2^20801387 is an apocalyptic number.

20801387 is a deficient number, since it is larger than the sum of its proper divisors (1640149).

20801387 is a wasteful number, since it uses less digits than its factorization.

20801387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23157.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20801387 is about 4560.8537577958. The cubic root of 20801387 is about 275.0198861652.

The spelling of 20801387 in words is "twenty million, eight hundred one thousand, three hundred eighty-seven".