20155412 has 6 divisors (see below), whose sum is σ = 35271978. Its totient is φ = 10077704.

The previous prime is 20155411. The next prime is 20155427. The reversal of 20155412 is 21455102.

It can be written as a sum of positive squares in only one way, i.e., 19044496 + 1110916 = 4364^2 + 1054^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2519423 + ... + 2519430.

It is an arithmetic number, because the mean of its divisors is an integer number (5878663).

Almost surely, 2^20155412 is an apocalyptic number.

It is an amenable number.

20155412 is a deficient number, since it is larger than the sum of its proper divisors (15116566).

20155412 is a wasteful number, since it uses less digits than its factorization.

20155412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038857 (or 5038855 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20155412 is about 4489.4779206496. The cubic root of 20155412 is about 272.1430367922.

The spelling of 20155412 in words is "twenty million, one hundred fifty-five thousand, four hundred twelve".