20150778 has 8 divisors (see below), whose sum is σ = 40301568. Its totient is φ = 6716924.

The previous prime is 20150761. The next prime is 20150821. The reversal of 20150778 is 87705102.

It is a happy number.

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

20150778 is an admirable 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, 1679226 + ... + 1679237.

It is an arithmetic number, because the mean of its divisors is an integer number (5037696).

Almost surely, 2^20150778 is an apocalyptic number.

20150778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20150778 is a wasteful number, since it uses less digits than its factorization.

20150778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358468.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20150778 is about 4488.9617953375. The cubic root of 20150778 is about 272.1221787468.

The spelling of 20150778 in words is "twenty million, one hundred fifty thousand, seven hundred seventy-eight".